I agree, they should buff the other ones to be more viable and just give Warwick/Udyr a slap on the wrist to keep them in check with Devourer.
Warwick should have his base armor lowered a little and his E and Ult need to be rebalanced. E should have more of a gap closing function as an active and have the move speed just be a passive on it, his ult should still do damage, but perhaps knock it to 70% value of on hit effects and a slightly shorter duration. That would cover his weakness a little of not being able to do anything without his ult as a gap closer with the mobility creep, and helps bring his ult down to more reasonable power.
Udyr is in a kinda awkward place I feel, he is right on the verge of being a jungle farming god, or being entirely unviable. Would have to be someone far more comfortable with him to suggest what would keep him balanced and not a damage powerhouse while building full tank P: