Lopez is great at picks and slipping the picks to the hoop. He will be a target for Melo or KP to pass to. He is a league leader in offensive rebounding and putbacks. No reason to believe he won't score ten points a night in a very similar way to how he did it in Portland.
Look at Lou Amundson's good games from last year. I think you will see ROLO give you a bigger and more consistently good version of Lou at the least on offense and much much better on D due to length and size and instincts. He's a great defender and he hustles. The Garden will love him.
ROLO is the best move we made in free agency. He and the Grant pick give me hope for next season. I think we will be pleasantly surprised by Afflalo too. I have hopes for Williams and KP, but could see them having rocky seasons.