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Seagears and Nwamu will be done after this season, leaving two open positions. (Obekpa sits out this year, and this graphic doesn't account for Cook's redshirt last season
The Rebs are actually now at "-2" spots left for the class of '16, since Cook is not really a senior.
There is still a strong possibility that Kobi Simmons will commit to UNLV, putting us at "-3"... for now.
Johnson and Vital seem to be more "traditional" commits, who won't expect immediate playing time and who both have huge potential if they become four-year players.
Early exit to the NBA might take one or even two players (I believe that McCaw could explode this season). Disappointment over playing time will likely be a factor for other players. Others may graduate and be free to transfer and play elsewhere (Cook? TBG? Carter?). One or more of the freshmen could end up being placed in a JC for a season or two at the risk of losing him (which is what should have been done with Demetrius Morant a few years back). This will be a subplot this entire season since the math will force it to be.