My bet's on Enishi for this. Although he'll be lacking in that there won't be any midair combat, he still holds the nerves of insanity and Watou-jutsu as his trump cards. His sword technique was designed to counter japanese swordsmanship (Most of what we see of Shishio's sword techniques are basic slashes, just accomponied by fire), and anyone who's seen the nerves of insanity in action will know instantly why that puts him ahead of Shishio, eheh.