I'm just anxious to see Omoi's skills. With Sai and Kankuro to back him up, this specific battle should turn out to be pretty good. One thing's for certain though, they don't need to drag it out very long at all because the shinobi resurrected have an unlimited chakra reserve. Sai's brother knows this and he also knows that he cannot be killed, that's why he told him to run away.
I kind of feel bad for Sai too, his brother was his only memories of having a bond with anyone before becoming part of Team Kakashi.
Also, I've read a lot of posts saying that Kankuro has a Sasori puppet in his collection. It would be freaking awesome if Kankuro learned how to make puppets out of humans like Sasori and he used Sasori's real body to make a human puppet out of it!!!!