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KT was OP because of its stats, T-A was OP at release because of its stat. And yet they also had incredible cost also at that time.
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Not really base stat was one factor, the performance of its counter was another. Su-85/M36 have been buffed allot and those units would be far less OP in the current state even with their original stats.
Point here is that base stat alone don't mean allot since there are number of other factor in play.
As I have pointed out to you the base that of JLI is not that great to begin with but there is a number of bonuses they get that are too much.