In the last two decades we have seen a wave of the music director Devi Sri Prasad. He scored music for top heroes and with successes turned as the lucky charm for heroes. People raved him as Rock Star Devi Sri. He went to Tamil and is extending his wave even there.
From commercial to simple movies he scored music that touched hearts. However there is increasing criticism over Rock Star's music becoming routine lately. Complaints are that he's set a templated music for each respective genre and is following along the lines which is definitely not receiving much praise.
This seems to be the reason why top directors are looking at other options. Aniruddh's music for Agnyaathavaasi sounds refreshing from the routine. Devi may need to be aware of his competition and re-tune his music scoring, else things may get difficult for him.