That is why he was below him lol. He didn't have good control of G2 or G3. He was hurting himself trying to keep up with Lucci this itself is a clear sign of being inferior to somebody. When you put your body at risk to keep up with another characters comfortable combat level. Happens all the time in fiction its nothing new.
Lucci is gonna hit Luffy with Rokuogan every time. He has the feats to back that up. Read the entire fight more carefully you will see that it was Luffy who pulled an upset over Lucci. Lucci was the superior fighter.
Luffy was on the
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from taking a Rokuogan, then he took another
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when he barely managed to get up, Lucci turned his
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thinking the fight was over and the corpse of Luffy finished him with a Jet gattling through pure willpower and to save his nakama. This is what you call an upset.
Remove Robin, have them face off with no motive but to take the other down. Nobody around them 1v1. Lucci wins 9 out of 10 times, he was simply a more seasoned fighter at that point.