manjrekar being a manager is like being a second dravind to join the company.
he was rock solid as batsmen but never showed any killer instincts, his running between the wickets was pathetic too

and he does not command much respect.
while shastri is the best cricketing brain india could not utilise any time. remember the only test he led against WI, he had courage to throw the ball to hirwani and told him go arrange your field and have a bowl and rest his history.
secondly to control everyone in this which includes dravid, tendulkar, sehwag, bhaji, yuvraj, pathan there has to be some who can control emotions, ignite passions, and create a strong bondage and at present moment there is no one other that shastri leaving aside gavaskar.