Mumbai did not win a single season for 1st five years and it was still owned by Reliance ....
I am largely in favor of retention and RTM card... If a team invest on player they have all the reason to benefit from his performance....
In the end its a team game and not individual performance alone...
There are some players like ishan, Nitesh rana, Sky, Simmons who have done well for MI but did not do much when they went to other teams...
Similarly players like Rahane, Dhawan, did not get the enough chances in MI but did well when they played for other teams....
Malinga is prime example not picked by any team in 2018, Mumbai took him on-board as mentor... Next year he was picked for 3 Cr only when other team could have bid more for him as Mumbai didn't had RTM and bowled wonderful last over to win 2019 Final....