How to deal with a one upper?

[StLucieBengal]

I think you should befriend the guy. Yes he is annoying but he has proven he will do anything and is willing to jump in on anything even when he may not know the subject matter. It's not a bad thing to have a real go getter in your corner. You can tone him down moreso by being a friend than you can h ignoring him. You also get to benefit but using his enthusiasm to allow you to spread your ideas.

Use this guy to help you. Enthusiasm at work is something that needs nurtured especially from a veteran coworker.