I've always put Silva and Ngoo in the same class, in that they look really impressive at times, but somehow you just kind of *know* neither of them will make it. They both just seem to lack that extra bit of technical quality that's so noticeable in the best prospects like Suso, Sterling, McLaughlin, Wisdom, Robinson, and a few others. I'd say at their ages it's really a bit ominous for them that they've not travelled to the US - Ngoo's going to be 20 in October, after all.
If I was being generous I'd say Silva still has something of a chance. He'll naturally improve as he matures and gets less selfish, and he does have talent. I think he'll probably make it at a decent level in the game. Ngoo, though, I'm not so sure. I saw him play at Spurs in the next gen, and that made me realise just what a massive gulf there is between some of these lads and senior professionals. He was absolutely appalling in front of goal - it was embarrassing tbh. He looked about a million miles off the first team, and at 19 that's pretty damning.
Still, hope I'm wrong.