As already mentioned, he's a youngster - and the line combinations/ roster construction we have, isn't ideal. Playing him with Larkin all the time would be best, because Larks is a two-way player..and then you would need a second two-way guy, best case a bigger, more physical forward (yes, the kind of player that the Wings have not managed to sign since.. forever.. ), to round out that line.. and then you probably give up less goals, when Ray is on the ice.
Plus, he'll continue to grow, in all areas, including defense. I'd be concerned (and not so positive about extending him long term) if he'd lazy, lacking effort, stuff like that. But the guy is feisty, doesn't back down, stays on the ice even after very hard hits.. so I guess you can grow him into (at least) a "solid" player on the defensive side.. and with his offense, he should be a clear plus in the future.