I guess that's true. There's apparently nothing Sasuke loves more than murdering his former allies. And it's a chance to have bro-times with Itachi.
I'm not talking about fair in the karmic sense. I'm talking about fair in the "evenly matched" sense.
I mean, don't get me wrong, I love Kabuto, but putting him up against BOTH of the author's OP pet characters at the same time?
The only way that's not a complete curbstomp is if Kabuto can find a way to get Madara to where he is to fight for him(which would actually be awesome to see an all out Uchiha-on-Uchiha brawl).