They've not interacted much, but I think Crane's not going to dismiss Jesse as a threat because he's eight years younger. He knows what he was capable of back then.

Walt is the common link in their CR, too. How they get on with him affects their relationship with each other. They might have something in common to discuss - and that's the fact Chilton is bad news, though Crane's motivations aren't altruistic. But I think I mentioned to Walt's player a while ago? Crane's never made a move on Jesse. And if Chilton went manipulating him somehow, he might try to maneuver things so Jesse keeps safe and he can fuck things up between Walt and Chilton.