All those are excuses and they are contradictory too. Once you're saying that the bowlers will become better with maturity and on the other hand acknowledging failure of a matured bowler like Ashwin. You gave example of that first no ball as if once an opportunity is lost it cannot be created again but see Amir, even though Kohli's catch was dropped he dismissed Kohli on the next ball, that's called quality.
The fact is, Indian bowlers are not reliable, not because they lack talent but because they lack proper grooming. India needs a separate and proper bowling coach like Glenn McGrath, who would teach them how to maintain proper line and length even under immense pressure.