Baron is stronger than any PG, SG, or SF in the league, except for Bron and Artest, maybe some others. He's also extremely quick in the open court (was even faster before his injuries). His 43"+ vertical and horizontal jumping ability, combined with his flexibility/body control in the air, along with his power down low, make him quite easily the most athletic guard in the league IMO. Well, at least when he was young and didn't have those injury-plagued years. Also, Monta might be on the SG list next year.
As for BD vs. AI, AI is likely faster (though BD's knee injuries have slowed him down a lot and BD is 3" taller and 50-60 lbs heavier), but all else (vertical, strength, etc) Boom has him. Also, Kobe could jump high in his prime, but he wasn't particularly strong or much else (could somebody inform me on his speed). Francis could jump higher than BD, but BD was overall a better dunker due to Baron's hand size and horizontal hops advantage (IIRC Baron used to do free throw dunks a lot). Plus, Baron's freakish strength and quickness surpass Stevie's.
Good catch on Nate and Francis. I knew I forgot somebody. To edit my post, I think prime Penny, TMac, Shaq, and Webb belong there, but idk where to put them.