We need guards, as we're losing Shabazz, Ryan, and Niels. Ollie has been recruiting perimeter players. We'd be happy with Terrell and Abu both, and there would be playing time for Terrell. Purvis is going to play point guard, they are not directly competitive.
You need at least 3 quality players to cover the SG/SF spots, plus a couple of younger/less heralded players for depth & development (typical roster: 3 point guards, 5 wings, 5 bigs). We have Daniel Hamilton and Omar Calhoun as wings. We need another high-quality wing in class of 2014. That is why Ollie is looking for another wing in this class.
Abu is certainly the top priority, we have to replace Deandre Daniels and he's the only guy capable of doing it. But Terrell would be a valuable recruit also.