You can be #2 in all those categories and end up being the best overall. Biggs isn't saying Tyson had a weak chin, terrible footwork, bad defense, or that he lacked power. He's simply saying he wasn't the absolute best in those categories.
Tyson was the most skilled fighter Biggs fought, Lewis didn`t look that skilled v Biggs, he just came out blasting, this was before Steward became his trainer and he was very green, Bowe wasn`t as skilled as Mike and neither was anybody else Biggs fought, he couldn`t avoid Mike`s shots while Lewis struggled to stop him and Bowe didn`t look too smooth v him either, Tyson completely out-classed Biggs, his offensive skills were far better.