What it does call into question is why bother having an academy at all really imho.
Does it?
Sterling is why we have a youth academy. So are Flanno, Ibe, Rossiter, Ojo, Smith, etc.
Some will come good and go on to become club legends. Some will play for us and maybe move on. Others will look promising but ultimately not make the grade.
There will always be more, lot's more, of the latter than for former.
I really don't know why Suso not making it here (and not really impressing when on loan anywhere) brings the academy into question at all.