I feel like it would at least give the stolen ult functionality, kinda like how Sylas goes invisible when using q after he steals Vayne's ult. Not sure how lower W cd on cast would affect balance, but at least being able to proc tentacle damage once would be a welcome change. He won't get healed from tentacles bc that's from Illaois passive, and the heal he gets already should be well enough. Plus their w's have similar functionality with differing effects, being they're a short dash that deals damage. Any thoughts?
Edit: thinking this over, that might make him better at doing what Illaoi does in any game that they're together, since he'd have essentially a better way of engaging via his E