Why not just make Kindred's passive like Kayn's but at the start of a match?
So instead of the problematic passive that kindred has now, why not just make it so at the start of the match Kindred either chooses Lamb or Wolf to lead the hunt.
Depending on who you pick you get different buffs/different traits to your abilities. Then, the rest of the kit would be easier to balance around not having a infinite scaling passive.
I'm sure that most Kindred players don't rely on the passive, if anything it would make it better because their next move won't be telegraphed to the enemy team with a GIANT BATSIGNAL above whoever they are trying to kill.