Recent events can be referred to support the above argument and one of which was the Jhoom barabar jhoom fiasco when Daler Mehendi went to town screaming about how Shankar's version of the title song was preferred over his version.
It is reported that Monty singh MD of Sawaariya had recorded 24 songs and it was brought down to 10 or something at the insistence of the director SLB,
I also recently read that one of the leading directors asked to keep a Mahalaxmi iyer version of a song in his movie rejecting those recorded in Shreya & Sunidhi's voices.
So anything can happen & unhappen in the big bad world of Bollywood.
