Honestly, I'd take it with open arms at this point.
There are obvious downsides to signing him - injuries, commitment - but big, big, big upside too if it all works out. It's the definition of a boom or bust signing...but at least there is boom potential, which a lot of our signings in recent years have never had.
Same reason I'm more excited about the Traore and Facundo signings than say Cavani. Cavani's upside has a heavy cap on it. Theirs don't.
I'm embracing my inner-muppet and jumping aboard the Dembele train.