Any role player on a super-talented team scares me. It is like Peja... when Webber, Bibby, and Vlade were on the floor, Peja was unstoppable... heck, he was an all-star, but once those guys were gone and he was being defended properly, his game declined considerably. So, Ariza might be a good risk, but there still will be some decline in his effectiveness when there is no Kobe, Gasol, and Odom to draw attention away from him.