We've seen him in action in AOTC and he isn't the fastest, nor does he have unlimited vertebrae abilities that you so gallantly speak of.
In my eyes, he was the fastest Jedi in the arena. If you OWN Cestus Deception you'd know for a fact that KIT IS UNLIMITED BY VERTEBRAE RESTRICTIONS.
That wouldn't nesicarily help him in a battle. It sure as hell didn't help Kit when he face Palpatine. You said he could sense his weaknesses.
As I said, Kit was in shock when he was fighting Palpatine. He had hardly enough time to keep up with the Sith Lord's attacks let alone sense his weakness.. And yes, it would help him in a battle with Maul as then he'd be able to sense the second that Maul loses his confidence.
Maul's confidence would not falter. He died because of his arrogance in the first place. There would be no flaw or weakness in Maul's confidence AT ALL so Kit loses Kudos.
Maul's weakness is his OVERCONFIDENCE. Kit would eventually discover this and then use it to his advantage, as he did whilst fighting the JK droid.
Did I say he could grab all of them? Can you quote me?
If Kit tried to swing his tentacles at Maul, Maul would grab them and put a boot to Fisto's face faster than you can say "Curbstomped!"
I assumed that the inclusion of "tentacles" and "them" was reffering to his tentacles as a whole.
And yes, I am quite the FISTO FAN (hence my sig).