I'm not going to be too surprised if that's what happens. I think Kishi values plot over progression lately; if it serves to get him from point A to point B he seems to go for it whether it really works or has the development to float instead of sink. If having Sasuke beat five Kage's would allow Kishi to move quicker towards a certain conflict/story beat I wouldn't be surprised to see him take it whether it made sense or not.
I hope I'm wrong though, because Sasuke defeating five Kage's would be the series biggest facepalm-inducing moment yet, especially after Killerbee smacked him around. Hell, just the thought of going after five Kage level's seems like a major lapse in logic for Sasuke no matter how you play it.
Edited by dl316bh, 24 June 2009 - 12:34 PM.