In respect to Bob's supposed upgrade (S4)....

This is an extremely tardy solution to the "how in blazes did Bob get so freakin' agile, etc" conundrum 'Booters were faced with in "Null Bot of the Bride". I seem to recall varying degrees of skepticism, but the answer seems fairly obvious to me...Turbo stated, rather laconically, that Glitch had been upgraded when the flock of keytools emerged from prone Glitch Bob (or rather, Web Bob) in the infirmary. Since keytools and their respective guardians exchange code, that would seem to explain newly rejuvenated/defragmented Bob's somewhat augmented reflexes, strength, and endurance at the end of the episode. He shared, at least partially, in Glitch's advanced status.

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I'm certain I'm not the only individual who pursued the same line of reasoning, and it's quite possible someone else already stated as much in a missive months ago...but I don't recall such an instance, and it's been ages since I was last here. I'm sure I've missed quite a bit. ^_^