Tough call. Given Holmes chin I'd say it's probably a fight that goes to the cards. The size difference isn't all that great either. I believe Holmes is about 6'3. Speed to Holmes though a young Lewis is much faster than given credit for. Jab again speed to Holmes, power to Lewis. But if there's no KO, speed kills. So I'd pick Holmes in a 7-5 type of score.
Lennox, most likely by UD. KO is a possibility. He keeps Larry at the end of a longer jab. If Larry bores in, he introduces him to Mr. Uppercut.