Thing is he ultimately failed
Rayleigh is one step ahead of him
He would know the result of the battle even before it happened.
So his "Big Brain" move isn't exactly big Brian but can't blame Garp..he did what he had to do.
So what would Rayleigh do in that situation? Let's say Kizaru = Kuzan. Rayleigh was locked in combat and couldn't gain an edge at all. Garp got an opening right away.
So would Ray be locked in combat with Kuzan while Coby dies, and the BB pirates take cheapshots at Rayleigh while he's focused on Kuzan? That's a triple loss. Rayleigh dies, coby dies, and his underlings screwed too.
The one thing I'll give you is that maaaybe Garp gained that opening possibly because Kuzan was hesitating while Kizaru does not gaf. But overall Garp came out looking great, I used to say Rayleigh was the standard for old gen but Garp is changing that I admit.