Do you think Joyce would be just as effective at the U18s? They haven't really been good enough for me, from what little I have seen or heard of them.
The current group are suffering from a big imbalance in the positions they play (it's been three or four matches since a CB actually featured for them, for example), but also from the fact that they've recently promoted a handful of their best to the U21s. So while the U21s get to use the very best of an age-group ranging from some 17- and 18-year-olds all the way up to Memphis and Jones - a very big talent pool, basically - the U18s are scratching for scraps.
Which is fine. Football at U18 level is about doing whatever is best for each individual's development, not about preserving team balance or squad size or winning matches and trophies. These things tend to wax and wane - I remember a solid two and a half years where the U21s were choked up with overage, never-going-to-make-it sorts like Macheda, Bebe, Tunnicliffe, King etc and the absurdly talented youngsters in the U18s - Januzaj, Daehli, Pereira, Wilson, Pearson, Rothwell, and many more - couldn't get a look-in despite being more than ready for promotion. They were thrashing every comer - a 7-1 defeat of Newcastle featuring five Wilson goals was one of the best U18s performances I've ever seen - and meanwhile the U21s couldn't buy a win. As you can imagine, at that point everyone and his mum was pointing at the U21s, ignoring the U18s, and saying that our academy was shit. Now it's the other way round.
As I say, these phases come and go in the youth teams, and it rarely has anything to do with the quality of the kids or of the set-up. Let's not forget, the Borthwick-Jackson who's impressing for the first-team was one of those much-bemoaned U18s only a few months ago.