Proof of him not using FS? Depends on how fast Zoro is compared to Lucci. Lucci can't =/= Zoro can't. I always maintain that Luffy is faster than Zoro, and FS is the true deal-breaker. Luffy wouldn't be ahead of Zoro before awakening if it weren't for FS.
He didn't use any advanced haki against Lucci, we see neither ACoC nor ACoA, so the evidence is on you to prove he used FS.
You literally just said you're curious how Zoro will deal with Lucci's speed, implying Lucci's faster than Zoro, Lucci who was being blitzed and sleep dodged by Luffy....