Well then try this on for proof: What happened? Blaming plot is just another form of being counterfactual. Why in the world wouldn't Rinnegan win if it could simply absorb *everything* absolutely free of restriction? We saw a few weaknesses during Pain, but not much else. Also, Sasuke might not have been able to take his time that fight due to chakra limits, or perhaps his emotions were just running wild. Dunno, but what happened, happened. Burden of proof is on those saying this path has no limits.Realistically? Nope. No such thing. This is manga. Proof has to be given. The only downfall of preta path as shown in pein arc is that one has to be able to control the attack being absorbed. Sasuke can control whatever chakra naruto throws at him. The only other downfall I see. Is that absorbing a tech takes a few seconds I believe so while doing that someon e could attack with taijutsu. So its actually better to just dodge very powerful in battle situations. But sasuke was in bijuu susanoo. He could have taken all the time in the world. But plot.