Complete Rubbish Paz - if you'd actually watched any u23 football, I'd think about taking you or your opinions seriously.
Brennan, like many other youngsters, is out on loan - for him to learn about competitive league football - but, if you listen to Gareth Ainsworth (Wycombe manager) he very openly talks about the gulf between L1 & the Championship - this is how we develop our youngsters without risking our own league position.
The players you list are from several different year groups. Yates & Worrall have both been loaned out & both faced criticism at NFFC in the past, but are very clearly growing in stature.
Mighten - no evidence to suggest that he will be a success, but I hope he is obviously. Arguably, if he was loaned out - he could be getting game time, rather than sat on a bench!
Cash is doing really well at Villa & I'm pleased for him - definitely a success for our academy, but others have been sold & not done so well.
Arvin Appiah - year above Mighten, has done nothing at Almeira & now loaned out.
Brereton has scored 5 in 70 appearances for Blackburn in 2.5 years!
What has Burke achieved in achieved in the 4.5 years since we cashed in?
He's become a journeyman, having been moved on almost yearly & scoring just 9 goals.
None of those 3 attacking players can hold a candle to Grabban's record, who has proven his worth season after season. In fact this, season - despite his age and injury record, he has a better goals per game ratio than Burke or Brereton.
By all means, back up your assertions with some facts!
There are plenty of good prospects in our academy, but we only learn about how they adapt to league football - when out on loan - if any of the u23s were good enough, we would be playing them now!!