Funny guy.
Actually, he likely has more than 1 element, may even have all 5 of them. I wouldn't doubt it personally. I doubt most of his techniques are as strong as his Dojutsu techniques though. Also, he has Earth and Water, as he used Mokuton. So, technically, he's exhibiting 4 elements technically as of right now. Not to mention Bansho Teni'n(Which may or may not be an element of its own.)