In all fairness, those 3 players - Oakley-Boothe, T. J. Eyoma and Kirby - simple weren't good enough; which is why they never got games for Spurs. They are all playing in the lower divisions now.
8 of the squad players are now still with an EPL club.
en.wikipedia.org
Poch refused to allow youngsters to go out on loan and nor did they get playing time - he refused to allow them to play u21 games when training with the first team.
That is the most ridiculous way to train a footballer - the classic example being Foyth bought for £10m, not allowed to play football for 2 years only train ....... so no surprise he gave away 2 penalties on his first team debut and only made about 14 appearances before being sold ...... and since then he's become an Argentine international and regular club footballer.
That is why post Kane (who had already had loans and scored 3 PL goals in 6 starts before Poch arrival), there were no players coming through the academy except Winks.
He is a disaster at bringing players through from the academy - he can only develop players when they have already had some first team experience.
Of the 3 E u17 players two of them were almost perpetually picking up minor injuries in Poch's notoriously hard training sessions,
One thing I don't think is sensible is for the Head Coach to appoint as Head Physio a son with no practical experience after his qualification, as youngsters bodies are still not mature and may not be suitable for notoriously hard work outs.
So overall a score of D- for his abilities to bring youngsters through from the academy - but of course a good coach for First Team.
Mourhino was better in allowing youngsters to go out on loans and gave debuts to several players when we drew a non league club in the FA Cup but was only at Spurs for a little over a season so had little permaneny effect on the youngsters
Conte of course had zero interest in youngsters - literally disturbed u21 training sessions to borrow u21 players to act as 'cones' for his training sessions.
And that in summary is why Spurs have brought no players through ...... which is why we now are starting to have HG issues at first team level. Its shear bad squad/player management