Bruh your the one being hypothetical actually. If he had the feats in base that you claim then oda would have had luffy doing more against these opponents in base lol. That's point black. In wci he had luffy spam base against Kat until he got the drop on him in g4 after hours of fighting. Oda then had luffy fight kaido in base until he got the drop of him in g4 and g5 after fighting the dude for hours. But yet when he fought lucci and arc after oda had the dude JUMP straight to g5. When he had luffy fight kizaru oda had him use base then g4 then g5 within a matter of minutes. When oda had luffy vs seraphim oda wrote in jumping straight into g4 and directly had luffy compare their durability (while in flame on mode) to kaido. So in any of these scenarios in egghead if oda wanted to portray that BASE luffy > lucci and the seraphim he would have shown it in the arc
You're still talking hypothetical, wouldn't it be like this if it were, and so on. I look at what they can do and the basic luffy is clearly superior. There is nothing more normal than comparing the endurance of the Seraphim to the kaido. Seraphim have the greatest stamina in the OP universe, they can't take damage unless they put out the Moon Flames and no one can hurt them, you forget that the author of this series is Oda Oda decided that Luffy should use Gear 5 there and drew it that way because they needed to see him in that scene. Actually, there is no need to mention all this, luccinin didn't stand a chance against Gear 5, he didn't even manage to resist, this difference normally shows that lucci can't fight g5, luffy's comfort in fighting Saturn in the last episode is very revealing achievements, but if it needs to be clearer, I don't understand how strong you think lucci is, even luffy's g4 form before onigashima is at yc1 level,
So how can you think that luffy needs G5 over lucci?