mybe its not credited to his name in this case....
but this would spoil his reputation as a original composer when general public get to know about this copy... they wont go deep into wondering who forced him to do that...
the starting piece of that tune was intentionally made that way...
if u listen to the words coming in that tune u would better understand what they attempted to do...
"kaettu rasittha paadal ondrai... meendum indru nyaabagam thoonda..."
and the kaettu rasittha paadal is that "aagaaya vennilaavae.."