Agree with Chong going somewhere on loan, a loan in the championship or abroad would do him good IMO. Needs first team action regularly, and needs to get used to the physicality of professional football, but the raw qualities are there for sure. Pacey as feck, has good movement and work rate, and he's a good dribbler. He's nowhere near as refined as Gomes or Greenwood are of course, but he has all the qualities to be a top winger as well IMO. Gomes looks so mature and refined from a technical POV, while Greenwood looks like he has everything to smoothly develop into a top striker, while Chong needs some of that exposure at the top level to improve in some aspects and really develop him. I do think there's the chance he has a really rapid development once he sorts out some of his issues though, certainly wouldn't be a surprise or something with his skill set to actually make it at the top.
Probability speaking, I doubt that all 3 of Chong, Gomes and Greenwood are going to make it, its ambitious as it is expecting 2 of the 3 to make it but i think both Gomes and Greenwood will. Chong is the bigger question mark, but that doesn't mean he doesn't have big talent and potential himself. A loan would be best though, and preferably a championship loan, or maybe to the Dutch league. Not yet ready for prem/bundesliga/Spanish league.