I would have put him at 3.5 at max, probably 2.5. If he is 5, then his genetics are not what I suspected.
Look at his face and body not his rack. Roman nose, swayback/large gut area. Older buck for sure. I'd have guessed 4.5-5.5 just from the pic. Definitely a cull buck, just not great genetics for growing a big rack. I've killed 2 in the last 3 years around my place with very similar traits. Big bodies, decent mass but no genetic predisposition for width or height on the rack.
They tasted just fine though.