Only if you don't care about the initial investment, you keep "leaving" this out, and yes the first reason they went player hording is specifically to sell them post FFP implementation (you really think RA gives a rats ass about player development?)
Chelsea may be running a decent buy/flip model now, but it required investment in the beginning that I don't think they have recouped (hard to tell which part of that is on the £1.5B+ on the IOU to RA)
Amos, Eyoma, Oakley-Boothe, Edwards, Cirkin, plus CCV will go this window
Why do people trip over themselves to brick on the club?
Spurs Academy works, it pays for itself (surely makes a profit) and right now -> Kane, Skipp, Tanganga, Winks, Scarlett, Paskotsi (6 players) are genuinely part of the squad.
What more are you expecting?