Building teams around a single mechanic is never going to be a great stratagy for arena imo.
Considering the changes made to counter recently, these teams all seem to have an Achilles heal called a TANK.
Consider a pure counter team vs. a team with Old Ben and ST Han.
Han taunts, Old Ben uses offense down, match over. IGD,Aayla,Barris,Old Ben,Fives, and Kit are all too slow to avoid this trap. Every counter your team makes for the first round or two would give a great amount of TM to your enemy.
Not saying these charecters arnt good, but put them all together and you have a team without enough speed and not enough damage or flexibility.