Luffy, Shirai tensei would not affect him since he is rubber. As for summonings, he easily knocked out giant sea kings in the begining of One Piece he would have no problem with those things, same thing for the paths.
Indeed, Pain just isn't up there with Luffy, as of now too. Though he will have a hard time with this match.
"Luffy takes this match with some difficulty, mainly from Deva, Asura and Animal paths. The other three are limited in scope of abilities to be of threat so they can be quickly dispatched by Luffy. Preta Path would be very worthless for this battle as nearly all of Luffy's attacks are physical blows. The Deva and Animal Paths would make use of gravity repulsion and summoning spammage to keep Luffy at a distance for attacks which would work for a decent amount of time. In addition, the Asura path's been shown to take a great amount of damage taking attacks from Choza and Kakashi plus demonstrating a great amount of physical power. But, these won't be enough to kill Luffy thanks to his body and strength. If the Animal Path is offed, so go the summons. If the Deva Path can find the time to prep one of his larger scale attacks like the city-busting version of Shinra Tensei and Chibaku Tensei, then it could potentially be a threat to Luffy. But this is assuming the three react quickly enough to off the Straw Hat Captain before he makes use of his Gears and Haki techniques. If Luffy resorts to these, then Pein is royally screwed. "
" @hitsusatsu11: Pein's small-scale Shinra Tensei on close targets works kind of like getting whammed by a cannonball. Luffy's body is shown to be very resilient against blunt attacks. So the assumption here is that small-scale Shinra Tensei on Luffy would be no different than getting whammed by a cannonball.Your assumption, my assumption is Deva can use this to pull luffy in to meet a soul fcuk attack.
The soul sucking from the paths you mentioned would be worthless as Human Path would need to get extremely close to Luffy to do the attack and Naraka Path's use of it against others is only within interrogation methods, which the Peins aren't doing for this battle. "Human Path can rip out souls, he also interogated ppl when he wanted to know where Naruto was, doesn't have anything to do with this situation, he can still rip out a soul.
what would happen is luffy goes G 2nd and attacks, pein reflects his first attack sending luffy back but luffy recovers in a split second and unloads on pein by appearing behind him before he can recover his grav attack fast enough, and lets say he uses his mini moon attack, although its not really big as a mini moon a small island maybe but not a moon, when he went up against shiki,(which was not considered filler) luffy busted shikis floating islands with giant thor axe, now that he has haki, its probably even more powerful than that "But remember there are 6 Pains here, all share the same field of vision with the rinnigan, all can use basic shinobi bunshins and substitutionary, Luffy could hit one only to realize its a wood substitution, then be left open to a soul steal or a mini moon, and you can see the mini moon is far bigger than the mountains in the picture.