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It's all speculation and auguring from hints and hearsay of what is happening behind the blue curtain. I can totally see that the staff isn't interested in a 5th year. AWIII and Gillon were terrific offensive players, but they were poor to mediocre on defense. That's a non-starter for JAB. Maybe if they had two years in the system they could have been better, but 5th years don't get that luxury. Geno had his own issues, and none endearing to the staff.
A 5th year not expecting starting minutes who could be a 3rd center and 3rd forward for 20 mpg? I'm sure the staff would love to have one, but whomever that might be is probably not very good at zone defense. And in low possession games, JAB is loathe to give up a single possession to a less than capable player.
For me, this coming team with all returning minus Battle is still an above-average to good team. IMO, 2019-20 though could get real dicey - they need an influx of talent and the sooner the better.