Gear 5 Luffy is definitely faster than Lucci by a lot. That's not really debatable (
Luffy literally slept while dodging him), but the point still remains that he was able to dodge at least one attack from him, which still places Lucci's speed above Yamato's Thunder Bagua since Gear 5 Luffy was able to blitz a Shuron Hakke Kaidou's TB while Yamato's best speed feat is matching a pre-Shuron Hakke Kaidou's TB speed.
We're comparing strength of Haki (needed to break out of ice), not the the amps given. Also, that's still pretty debatable in and of itself.
I mean to say 0 Kenbun feats that would put her above the standard Kebun usage level. Lucci was able to sense the Elders with Kenbun at a relative pace to Zoro (
same reason we rate the Admirals as having relative Kenbun). Zoro's Kenbun is above the standard Kenbun usage level.
I genuinely don't think she can. This isn't even hate. I mean we're talking about GEAR 5 LUFFY here. Yamato was in awe of the power of BASE LUFFY and was even more shocked about gear 5. I really have no reason to believe that Yamato can replicate this.
A limit that Yamato seemingly can't reach. This was a Lucci after getting destroyed by Luffy 3 times and having to recover each time, and then fighting the Seraphim, and then fighting Zoro for an extended period of time.
It hurts me to defend Lucci here but I'm trying to look at this from an objective standpoint. Even on the profiles, Lucci scales above Yamato in durability and AP to the point where her attacks won't be much of an issue. I can't see her winning.