Funny.... He crossed my mind the other day and decided to sit down and check a couple of his fights out again. Good talent... Power, durability maybe a tad bit basic but I see no reason why he couldn't have been a world title challenger(and you'd have to give him a punchers chance against chinny titlists like YPH) We may never know what he ceiling actually was but - but definitely a solid European - fringe world guy at the very least.
He should stick to training fighters and playing the piano! He's young but nearly a decade out of the ring is a long time even if he's kept himself in shape and in the gym. Only if he feels like he needs to prove something to himself(maybe a short run) should he return, the division is stacked now and it's doubtful he'd get anywhere other than being used to pad someones resume.