Defense is more than just athleticism. It's effort and mental. Gabe was an elite defensive player because he wanted to be one and had the smarts/experience to execute it. Matt Thomas at first was not good defensively but developed into a plus defender.
My concern is yes well be more athletic next year but with that we are younger and does defense fall off because of that?
For what it's worth, I do think the defense declines next year. Hard to maintain that level of defense with so much turnover. Chris has stated that our style of play, TJ's first two years, is very deliberate, due to personnel. I do think we'll see an improvement in offense (after portal is all said an done) that somewhat negates the defensive drop off.