The speed boost is useless since Gai can easily keep up, and because Kakashi is with him. The boost in speed doesn't even do much to change the outcome of a fight between Gai and the Raikage alone.
The speed boost lets him dodge kamui. Gai is still faster than him sure, but he can't do anything to the Raikage. His strongest move is tanked.
Against Kakashi alone? Yeah. But with Gai to distract and hold him off in CQC? Nah. Especially when Gai can just use Hirudora to shoot the Raikage towards Kakashi, and then have Kakashi warp him with Kamui then and there, since the only thing he'd have to be able to follow is Hirudora's movement speed.
But then Kakashi would die too in the explosion if Gai shoots Raikage towards Kakashi with Hirudora. Lmao. I guess that still counts as a win, since Gai survives, but that's out of character for Gai to willingly kill Kakashi.
If he warps them both away then no, he doesn't die. :lol.
If Hirudora has the same effect as FRS on the Third and leaves him incapacitated for a few seconds, can't Kakashi warp Ay during that brief period?
You don't get tired trying to make what if scenerios for the same characters?
When has Kakashi ever warped something as large as Hirudora?
He warped the Mazo's arm, thus all he has to do is make a barrier the size of Hirudora's head and it flies right in just like Susanoo Arrows did. Not to mention Hirudora in it's smallest form is only as tall and as wide as a V2 Susanoo, or actually a bit wider and taller.
4th Ay is worse than 3rd Ay for speed.
4th was being kept up with by MS Sasuke, where 3rd was dodging KCM Naruto within inches of his being. His physical reflexes and combat speed show 4th up quite a lot, since the latter was outpaced by KCM Naruto despite being fully clad.
In short, 4th couldn't keep up with KCM Naruto but 3rd could. 3rd has also showed much better offensive and defensive, so what are you trying to achieve by downgrading him?
4th Ay is worse than 3rd Ay for speed.