Essence Split -
This skill doesn't fit him in any possible way actually (when did you see a werewolf that splits himself in two, it also has anti-synergy with the ultimate).
Nukes are not his stuff.
He is physical DPS hero, not nuker.
Also, this skill reminds me too much of Whirling Axes (melee).
Only different part (except numbers) is that it has synergy with other wolves.
Feral Curse -
This skill is OK, T-null.
I would like if something like this replaces his current 1st skill, only that it's active.
For example, name skill Infection Bite (or something like that), make it deal some physical damage and maim, but if target dies while under the effect of that skill, it will actually turn into a werewolf.
Werewolves will not have duration, but he has only a limited number of them he can control.
Overall, it's T-down.
I just think that he should get more werewolf-like skill to replace his current 1st skill and that's that (I think that Infection Bite would be a good one).