Greenwood - 17 year old Van Persie, IMO will be a starter by the end of the season but because of age understandable to take it easy. Injuries and how he deals with the step up in expectations/fame/etc will be the only limitations, no indications that any of that is a problem but it's always a question mark at that age. Has all the talent and physical attributes to reach the top though.
Angel Gomes - immensely talented, looks very mature on the pitch and really hard to take the ball off of and makes smart passes and a great first touch. Looks like he'd suit the classic Barca style as an advanced midfielder with his play style. Tiny in size though, might be protected and only used as a bit part player for a while because of that (similar to Lingard not actually breaking through until like 22 because of his size, though Gomes is far more talented). Contract out next summer I think, and Barca's been rumored to be sniffing, so important to give him a role so he stays.
Play style comparison - a smaller David Silva?
Tahith Chong - 19 years old so a bit more developed. Looks incredibly thin but is very pacey, plays like a classic winger/young Ryan Giggs. Being that play style though leads to inconsistency. Would definitely need to bulk up a decent amount to deal with the premier league IMO, but raw attributes are all there to be an excellent winger, though with wingers, it's always how they deal with inconsistency/decision making. Nani had the talent to be world class but only had 1 or 2 top seasons. I'd guess he either goes on loan to Bundesliga or he stays and gets game time as a squad player but nothing more as of yet. In terms of guarantee of talent I'd have him behind Greenwood and Gomes, but capable of being a brilliant winger if he can handle the physicality and if his decision making improves as he develops (not so much a problem now, just a normal problem with all young wingers).
James Garner - only 17, which as a holding/controlling mid means hes a bit away from any role IMO. Rare to see those types break through til their 20's. Looks talented, creative, a very good passer from deep, just doubt he'll have any role past the odd sub appearance.
Dean Henderson - was one of the top keepers in the championship last year, probably back on loan to Sheffield to be a premier league starter. Highly rated, long term view of eventually replacing De Gea, but De Gea is only 28 I think, not exactly old for a keeper.
Axel Tuanzebe - Mourinho loved him, had a good year at Villa, they wanted him back on loan but looking like Ole wants him to stay this year. IMO if we sign Maguire he'd be 4th choice CB (Maguire, Lindelof, Smalling, Tuanzebe). Talented as a ball playing defender, being young the concerns are handling premier league physicality and dealing with the aerial threats which will take time to get used to.
So a summary:
- Greenwood - 17 y.o., starter by end of the year
- Angel Gomes - 18 y.o., can be squad player this year, talent to be top player
- Tahith Chong - 19 y.o., can be squad player, talent to be top player
- Axel Tuanzebe - 21 y.o., squad player at United, premier league starting level
- Dean Henderson - 22 y.o., premier league starting level
- James Garner - 17 y.o., highly rated, probably years away from actually breaking through because his style of play