Welbeck plays best by playing off or linking with other players so he's not really suited to being a lone front man anyway. At least not until he's a bit more sturdy on the ball.
People seem to keep thinking he'll develop into Drogba, but what Drogba or someone like Lukaku (or even Sturridge) has, which Welbeck doesn't, is that they're selfish. Welbeck is a different type of player which is why you can get away with playing him off the wing or next to another front man and still benefit, while Chelsea have to keep loaning Lukaku out to other clubs. Not that this is a slight on Lukaku because I think he's excellent, but he really is a typical lone front man style striker, like Drogba. Welbeck is anything but.
Welbeck's finishing is not his only deficiency in attacking areas though. Even his 'linking' isn't good enough in terms of final ball. I can recall a few occasions where he has had the ball in a 2 on 1 situation and he fails to release the ball to his unmarked teammate. He's a worker, admittedly with technical ability, but cannot play a final pass or finish. When it's all stripped away, he is in effect playing a Heskey role for us, chasing and pressing from the front and flicking it on to his partner. He doesn't threaten the goal with a strike or pass though.