Just not the right fit. He could be productive, but I like Thompson's upside a lot more. Even if Thompson is a disappointment, Lopez will never be that great, so why go for him when we could have really solid potential with JT.
Thompson has more all around skills. At this point Lopez may be a little better defensively, but Thompson is probably a better rebounder, having averaged 12 plus a game. Thompson is probably a little better athlete, definitely a better passer and ball handler and just as big as Lopez.