Your point is well taken although Welbeck and Cleverley aren't the most compelling examples chosen as evidence to support the point.
Nick is an exceptional talent, well beyond Danny or Tom.
If we were on the cusp of a title winning side I'd go along with another loan, but we're living in pure fantasy if we think we're going to lift the prem trophy next season. It's a different story if we bring in Jose and 4-6 class players but I don't think either will happen and certainly not both will happen.
So let's develop a side that can grow together and have us back where we belong two seasons from now.
Nick is already better than Danny at forward and an overall better footballer than Cleverley, but that's a matter of opinion. And the opinion that matters as of this moment is Moyes, who as of this moment is still United manager.