Broadly, the main concerns of allowing large corporate houses to own banks relate to conflicts of interest, governance issues and concentration of economic power.
This acceptance gives the government a bonus transfer of Rs. 86,000 crores over and above the budgeted Rs. 90,000 crores
QE is tool which is used widely by Central banks & came more into limelight in early March 2015 when ECB launched a QE program.
Raghuram Rajan conveniently ignored the fact that of increment in saving doesn't guarantee more purchasing power. And this is what exactly happened during his regime.