I must admit I didn’t see/ hear the comments. It has been said by young players, possibly even Gordon, that they’ve found that when they step up the intensity and concentration needed is completely different. But we have a whole raft of sports science and specialists trainers , if youngsters need something specific to help them, like short burst of intense training at the end of a first team session, then it should be included.
We appear to be very poor at converting our young players into genuine PL regulars. If they’re not talented enough ok , but they shouldn’t be found wanting because of their fitness programme.