Agree on Altidore. He's got a great skill set (when healthy) that can benefit the team, but not as the primary striker to build around; none of the other strikers attributes mesh well with his abilities. Like you said, when chasing a goal, he's the guy to throw on to be a target while everybody else plays the technical game (much like we threw Okoli on last game).
Bradley isn't fluid enough. His best stretch was while playing for Roma, and he hit a pretty high standard, but they don't play fluid attacking, total football, whereas our younger midfielders definitely do. To have one guy be an anchor point in the MF limits what the others can do. It's part of why Mix took Bradley to the wood shed last year and got so far under his skin that Bradley started to get overly physical: Mix dragged him out of position when he had the ball and made Bradley chase, and every time Bradley received it, Mix was on top of him badgering like a Jack Russel. It was like Bradley couldn't help himself to go looking for space to operate, and that's a killer on the MNT level.