Dasavatharam Movie and my understanding from what i have read from various articles...

The 1st scene is perfectly connected to the climax, remember what Kamal says in the 1st scene, that he will not say 'Om Nama Shivaya' , but Asin tells him to chant it , but still Kamal refuses , ( in this kamal in his story tries to tell that ) Nambi believes in his god more than anything, but Asin feels 'Its ok if we change the god or chant other god's name, its life thats most important.' Now if u see the climax its JUST OPPOSITE.... Kamal doesn't believe in god much and values lives of people the most.... but Asin deeply believes in god and that too this dialogue comes when both Asin and Kamal's hand is on the god which came from the sea , and it also means that they are getting united from the place they departed hundreds of years back ( Kamal and Asin).The connection between the 1st scene and the climax in the movie shows the generation circle combined with supernatural powers of GOD and destiny.....!!!

Okay, this is slightly outside the chaotic system driving the film as a whole.From what I could gather he says that this story is about ideologies like God,the madness surrounding such ideologies and decides to tell the story of the Shaivite-Vaishnavite conflict to show how people go crazy in the name of God as an example.

As a loose end,it gets tied up in the end,when the Ranganathar idol is thrown out of the sea due to the tsunami which highlights the cyclic nature of life.Actually the Nambi character highlights both Chaos and Karma which I explained.That is the brilliance of this film,there is so much to see and understand.

Another explanation(and this is slightly far fetched--- as explained earlier) is that Govind is in fact the reincaranation of Nambi. As Nambi he couldn't protect God and died in the name of God.In order to fulfill his Karma,he is reincarnated as Govind Ramasamy who ultimately saves the world from destruction.The idol in the end somewhat hints to this theory; his story began with the idol and it ends with the idol.
As far as the connection with Nambi character and events in 12th Century goes...
The connection is based on the 'Butterfly effect '.

When Govind and Andal goes to the bury the idol in the sands, Andal will stumble on a particular stone couple of times...This is the same stone as the one from 12th Century hen Kothai rips her Thaali and flings it at Kulothunga Chozan...it will end up hanging on the stone. So, the implied message here is Andal is Kothai reborn in the 21s century.
During the encounter with Santhana Bharathi in the sand quarry, it is repeat of the incident from 12th century. Instead of Kulothunga Chozhan, it is the Sand Mafia which tries to inflict damage on the land.
This movie is a brilliant juxtaposition of independent characters whose paths cross, if only briefly, which is stunning example of Chaos Theory.

The idol that is drowned in the sea along with Rangarajan in 12th century by Chozha king results in a fault being developed at the bottom of the ocean and creates tremors more than 800 years later. These tremors result in the Tsunami. This again is a classic case of Butterfly Effect wherein a seemingly inconcsequential event (the drowing of the idol) saves Tamil Nadu from being wiped out off the face of the earth.

But actually kamal has not left anything for our imagination... Explanation struck the right chord, Kamal does tell to Asin in a dialogue that idol which gets sunken back then gets struck between the tectonic plates under the sea and causes tsunami...
Many people missed this dialogue i guess. Kamal's accent was so very perfect Tamil, that many people missed it.... Being perfect Is a Problem by Itself !!! :)

Although the explanation is a least possible theory, that is what 'Chaos Theory' And 'Butterfly Effect' are all about.
Its not just the statue that caused the tsunami, but it just started a large chain of effects which kept multiplying exponentially and finally lead to it after 800 years....!!
Why just say this concept is perfectly illogical... it is possible... thats what i have been explaining all the while !!!

The story line is that things going wrong are made to be right which involves many people and countries knowingly or unknowingly.

Knowingly:

-Bush, Manmohan Singh, Govindh, Fletcher, Balaram Naidu, Mallika Sherawath.

Unknowingly:

-Nambi's drowning to death with the heavy statue causes simple changes to the seabed that causes a devastating tsunami 800 years later [Acc. to Chaos theor it is possible.... although it is least probable... It is possible.. so nothing TOTALLY WRONG About it ]
-Poovaragan(actually saved kamal unknowingly---when poovaragan enters kamal and asin were caught by those manal kollayargal.There poovaragan distracts the gang helping kamal to escape),
- Avatar Singh(gave way to Fletcher to escape in the airport unknowingly),
- Japanese(saved govind from fletcher,he knows he is saving but he doesnt know about the play and was there only for revenge),
- Kallifulla and family(saved govind unknowingly)........
-Vincent is a dalit leader of a lower caste( the so called ) but saved an Iyengar Girl ......and at the end becomes the con of the Iyengar Paati !!
- If Shingen Narahashi's sister was not killed, Fletcher could have killed govind and used the virus for wrong purpose..

This is based on Chaos Theory..!!!!!

It is marvellous that Aandavar Kamal has used such a device in Abhoorva Saghodhararghal, way back in 1989. To kill Delhi Ganesh, for those of you who do not remember... yet another Eg. of Chaos Theory And butterfly Effect !

The plot concept of Dasavadhaaram is logically explained by a machine used by Him in His own screenplay back then too, before 20 Years!! Be it a coincidence, or He possibly had that in mind as an inspiration, it amazes me!!