Ikki still has amps and a bunch of other things up his sleeve. Like trackless step, could Garou copy something he can't see? And obviously fate hax if he's pushed too far.
Lad, amps ain't helping, ever, against Garou unless they're absolutely ridiculous ones with a string of zeros behind them.
Ignoring Garou starts off like 50 magnitudes above him in power, but I assume you mean speed. Ikki amps his speed 600x, so he's 600x faster, cool that's great, he goes to attack, but by the time he's finished throwing that attack Garou's passive AD, mimicry and a bunch of other wacky shit has mitigated that advantage already so Garou just reacts, copies and uh oh Ikki is in trouble. And Ikki just ****** himself because he gave Garou a 600x speed boost he could copy, which he does, and then gets even faster because his speed is always getting better based on every fight we've seen him just about.
Which is another thing to note, Ikki has amps, but Garou's speed is going to be increasing nonstop through the whole fight, Ikki in speed equal won't be 600x Garou, because the moment the match starts Garou's speed is going be sky rocketing without stopping, thus making that 600x amp less and less, meaning the longer it takes for Ikki to amp, the less of a difference there'd be, and the less of a difference means less of a blitz, assuming Garou doesn't AD so fast he pulls that reverse uno card and he blitzes Ikki himself within a fraction of a second into the match given Garou himself can close speed blitzes in moments.
Ikki would need to amp the literal instant the match starts, can't even wait a second, can't even waste time closing the distance or throwing a few test attacks, no bullshit, no nothing, instant amp, and then he must go immediately into his best bullshit hax. And that's assuming they start off close because if he starts off at SBA or something, by the time he covers that distance Garou's already gonna have mitigated it with passive speed AD.
For all the sus bullshit that gets thrown around with Garou, one thing he absolutely has in spades, is ridiculous AD, even before awakening his speed increased to where in milliseconds he could perform blitzes on those he was equal to, and against Saitama it's even better, seemingly making noticeable jumps between blows.
Garou stomps FRA, shouldn't even be added.