I'm an NC State fan so I've watched Manny throughout his career. When he played LB his first 2 years, he didn't seem to have great instincts for the position. However, he was only a Fr/So and NC State was in a 4-3 scheme. He has great instincts now, reads and reacts to the run well, rarely bites on fakes reverses/bootlegs. I don't necessarily think the Dolphins will target him, though I'd love it! When Manny rips off a 4.5 or better 40 time at the combine. Some teams will be all over him. He also is a great special teams player (see all the blocked kicks).
Oh, one more thing. Mario Williams is a BEAST.