Lebron outweighs Laimbeer by 30 pounds. Laimbeer was a bully who only really pulled cheap stuff on people smaller than him. He wouldn't have had the balls to do anything to Lebron. Mahorn, maybe...
And seriously, whose handchecks would have handled Lebron? Pippen and Aguirre, maybe? Otherwise, there weren't any perimeter defenders in the late 80's/early 90's who would have been able to handle a player with Lebron's combination of size/quickness, handchecks or not. Do you really think guys like Joe Dumars and Alvin Robertson would have been able to defend Lebron anywhere close to as effectively as they did Jordan? Sorry, I just don't see it.