He is at least 3.5 and I bet he has an injury somewhere. It would be on the opposite side of the smaller antler. He will never be anything decent in the antler dept. If you don't mind waiting till permit bow for your next buck tag. Take him!
Just another example of why this only one buck per season for us bow hunters sucks. Back in the day I wouldn't have thought a second about shooting a buck like that because I knew I'd still have 3 bucks I could take wit the bow if I bought a permit. Now we get one a season and have to pay extra as well for the right.