I'm not disputing that we need to aim higher to break the top six. The sides above us have the likes of Kane, Lukaku, Sanchez, Auba, Aguero, Firmino, Lacazette, Higuain and Jesus to call upon in that central role.
My point is, I can see why Marco would see it as a gamble worth taking.He's a striker with a point to prove, when he's fit and on form he's in the England squad on flexibility and reliability alone, irrespective of his goal record. He's had a tough time with injuries and he's still only 28, so should be at his peak. On a free, on reasonable wages, it's worth a punt.
I don't think that Welbeck would be brought in as a starter and would fully expect others to come in alongside him up top.