A small way Riot could buff Rengar without turning him OP again

Necklace: Flat bonus removed, back to + 30% bonus AD (42% for head of Kha)

CC immunity added again on empowered W but maybe reduce the duration to 1 second.

That is it. I doubt those 2 changes will make him broken like he was on release (6.22). EDIT: I doubt it because his clears have already been affected a lot, it will just make him stronger AFTER the ganks were succesfull and he managed to get the stacks. Also, the CC immunity helped assassin Rengar way more than it did Bruiser Rengar. While CC immunity was a bit oppressive top lane, top lane Rengar would have to suffer by getting the stacks later than jungle Rengar, therefore, the buffs I suggested would only come together late game, since only 1 of the 2 would be FULLY accessible and useful early/mid game.

I'm not saying CC immunity would be useless on Jungle Rengar, I'm saying it won't be as useful to him as in Top Lane.