It’s absolutely negative to say a player may have his ”development” harmed by being asked to go in with 15-20 mins to go and to try to get on the end of something!
There is absolutely NOTHING negative to be taken by a 19 year old who is asked to do that! In fact, the absolute reverse would be true, and as a young lad who was asked to do that at a big club (and not even in a big PL game!), I can tell you it made me feel like THEY HAD GREAT CONFIDENCE IN ME!
There was literally no downside to putting on Delap, other than if he missed an absolute sitter to win the game, or tie it! But, as such a great coach, I’m sure Pep would have protected him and let him know he trusted him or he wouldn’t have put him in the field!