Sam Whitmer aka Starkiller was apparently listed in the credits under "additional voices"...
Not sure what voice that could be, he's only done Starkiller, Palps and Maul in the past and it obviously ain't the latter two...
I'm not buying that Marrok Inquisitor is Ezra, it doesn't make any sense especially after Ahsoka fought him...There is NO WAY she wouldn't be able to sense him through the force like she sensed Vader was Anakin...That would be really bad oversight and writing which I can't fathom Filoni being guilty of...
No saying its Starkiller either, but If Filoni fukks around and makes him cannon...
They definitely going to have to change him drastically though cuz he's ridiculously OP...