Davis
Giannis
Durant
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I understand they're only highlight reels, but I think we can all agree there's some obvious displays of athleticism there from which something can be taken. Nothing definitive, but discussion worthy I think.
That said, the thing that stuck out to me and I mentioned this earlier, is that the vast majority of Davis most impressive displays of athleticism involve someone creating for him, generally via the PnR. So, while he's an extremely bursty athlete in terms of his leaping(stronger than KD & Giannis in this respect), which is evident in his ability to finish and challenge shots from uncanny angles & distances, what I question is his lateral quickness, coordination, balance, body control, & explosiveness on the ball relative to Giannis & Durant. Durant's first highlight is him beating Paul George off the dribble before baptizing Roy Hibbert at the rim for crying out loud.
NO-KG-AI, you mentioned that Deandre Jordan is someone whose leaping ability people tend to overrate, but I find that his athletic qualities align closer to Davis than Davis does to Giannis & KD. As you said, they're both extremely long guys who are special not because of their vertical leaping ability, but the combination of their uncanny length and their burst from a stand still allows them to finish and challenge shots that most other players couldn't dream of. Case in point:
He's clearly a more explosive leaper than Giannis or KD. Like Davis, he gets up quick as hell, runs the floor like a Gazelle, and has ridiculous finishing ability due to his length & burst. Also like Davis, because he lacks the coordination, lateral quickness, body control and other aforementioned attributes that allow Giannis & KD to create from the perimeter in a fashion nigh exclusive to players they dwarf, his most impressive athletic displays generally involve someone creating for him, via the PnR. After analyzing this further I find that Davis athletic profile is more so similar to Drummond, Howard, Whiteside, & Jordan; extremely athletic bigs, but bigs nonetheless. Whereas KD and Giannis have the type of generational athleticism that makes them unique in NBA history relative to their size.
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For what it's worth, here are their respective number of dunks over the last few seasons:
15/16 - Davis = 148 / Giannis = 146 / Durant = 106
14/15 - Davis = ? / Giannis = ? / Durant = ?
13/14 - Davis = 146 / Giannis = 61* / Durant = 146
I couldn't find their numbers for the 14/15 season, if anyone could help me out with that it'd be appreciated.