Demetrius Jackson looks really good loco but most athletic since wall? There have been a lot of athletic guards. He has really good separation though and can can really get up though. He sort of reminds me of a mini westbrook. Won't be that good but sparkplug for sure.
Westbrook is much bigger and even more explosive than DJ. Similarly had questions about his ability to play PG coming out of college, and he had bigger questions about his shooting. I think Eric Bledsoe is the best comp - super explosive but not quite a candidate for greatest-athlete-of-all-time like Westbrook is, 6'1 with a good wingspan and a strong frame, good shooting ability, and unclear PG skills. If Jackson can develop into a great defender with solid PG skills like Bledsoe (and Westbrook) did, he'll be a steal in the late lotto.
I do think that DJ is the most athletic guard since Wall. Main competition is Lavine, but they have such different body types (Lavine so much skinnier) that it's hard to compare them.