And now prove the title wrong... through the story if you can.
Ok so this is a concession because then it's not Kamo saying he is indeed the fastest, he's bringing up the title, and it goes against your point.
Holding back his speed cause he wants to kill Yuji? He's just holding back yeah.
He's holding back to the point where ******* Yuji can break his sword...
Naoya
badly blitzing Yuji and Choso:
Yuji vs that iteration of Yuta, being basically ******* equal in speed:
Same Yuji clashes with Yuta:
Same Yuji can break Yuta's sword:
So basically, if you think Yuta is going all out here, you think Yuji >~ Yuta in stats and Yuji = Yuta in speed, but guess what.
Here is a slightly manifested Rika completely overpowering that Yuji physically, with Yuta specifying to her "we're playing around":
Same Yuta is ~ Rika in physicals.
Same Yuta who kept up with Geto, who is equal to Kenjaku in combat speed, and who could casually perception blitz 3 sorcerers including pre-awakened Maki. Same Yuta who did this vs Kenjaku:
https://imgur.com/a/P4eOGhR
Same Kenjaku who could casually dodge piercing blood, which is faster than Naoya's best. So basically, it's clear Yuta was holding back to the point where he was physically relative to Yuji and relative to Yuji in speed. This makes sense because otherwise, Naoya would be >>>>>> Yuta in terms of speed, and he'd be stronger than Yuta w/o Rika, as he'd just be able to blitz and wear down, or even blitz + one shot
And now prove the title wrong... through the story if you can.
Miguel ~ Gojo > Naoya. That simple.
Geto is a sorcerer. Geto ~ Kenjaku > Piercing blood