The only problems would be classes that can get to high up places.
I mean you could probably try to add a super jump but put a really high cooldown on it like 10 or 15 seconds instead of 3-5.
He still needs more pushback force resist though, 100% reduce isn't enough if is designed without a rage (cuz its only 1/2 supposedly) and thats basically the only strength for the boss. The whole idea is you shouldn't be able to stop the rock, but he's quite stoppable as of right now.
He's new so we can experiment.
I think right now, on a full server. The Rock just gets bounced around so much, and since he has no rage or teleport, no one needs to be afraid to get close because they have knockback and escape potential, and the boss just gets overwhelmed, especially from perched snipers and anything on a ledge too large to jump onto.
(Wouldn't mind adding the winger's bonus jump height if he doesn't get super jump, that would be funny.)