No that is outright wrong. He was a standout player in our youth teams and he has performed well for both club and country. The top level might be beyond him like it is for many and moving him on does look like a good decision, but he is certainly not 'rubbish'.
Kids are very very unpredictable. Sometimes the least talented make it and the most talented doesn't. Take the class of 92 as an example. It was mathematically impossible for Beckham to do it but he did. Kanchelskis threw his dummy out of the pram. Gillespie fecked his chance, SAF wasn't able to sign Anderton and Becks tested SAF's patience up until he scored that wonderful goal. In Pogba's generation it was Ravel who stole the show. Meanwhile out of our young CBs the most talented was Evans who was preferred ahead of Pique, Smalling and Jones at one time.
Since they are unpredictable there skills can shift. Which in itself is an annoyance but its hardly a tragedy. The best 2 playmakers of the previous generation were in fact strikers. It was SAF who moved Paul Scholes in CM and Ancelotti who did the same with Pirlo. I haven't followed bambi on ice when he was a kid but it was evident from day 1 that he's as comfortable as striker as OShea was when we put him as goalkeeper. You can't play as a striker when you've got no finishing.
Which leads us to what truly ruined Welbeck ie hype. He simply refused to accept a change of role because he started believing his own hype of becoming England's no 1 striker and Rooney's replacement. If he only sat down and allowed his managers to shape his career then he would still be a United player by now. I mean we still keep the likes of Lingard around and lets face it, he makes Welbeck look good