Why not? Shunsui is no doubt stronger than her, but Rukia can get stronger as the fight goes on, like Ichigo. They're both the main characters and thus get powerups that'll help them win or survive. She is pretty strong, though if she doesn't get any stronger, Shunsui will definitely win.
5. Characters can only be considered as they have been "shown" (pic or text) capable of in the manga, except for some characters that might have limiter on them. Or you can say we may limit some characters to make the tournament more open and enjoyable for everyone.
This means you can't consider things such as the bankai(s) or hollowfication of characters that have not been shown yet.
Toushiro, having is Bankai for quite a long time, also being a Captain was far far behind Shunsui. then how can Rukia suddenly becomes stronger than Shunsui is beyond me.
Like I said, being main character will give her taht ability like it did to Ichigo. Why does it matter anyway if majority here voted for Shunsui?
But anyway, none of these opponents could beat him.
---------- Post added at 01:39 AM ---------- Previous post was at 01:33 AM ----------
Kenpachi did more damage than Shunsui though. He beat 3 Sternritters.
Shunsui Kyōraku 28 Rukia Kuchiki 2 Nnoitra Gilga 1 Mashiro Kuna 0
Shunsui Kyōraku is the winner of Group 11.
You can discuss the results in Bleach Tournament Discussion Thread