The UEFA rules are more detailed than many understand, so the analysis above is less easy to understand than I'd like as we start off with too large a squad to register - and its that which makes data looks confusing.
In summary, and answering your points :
We are likely to have only 2 Club trained players and hence only 23 players registered in the squad rather than 25 (due to having 2 less CT's) - Austin and Skipp who have experience to play.
No point in adding a 4th GK in Whiteman unless Ange thinks he is better than Forster other than if it looks Ange has a bigger squad (misleading if Ange would never play him).
Ange may want/need more than 23 players - and if so can get that with UEFA list B players (ie u21 and 2 years at Spurs) such as Devine, Scarlett, Donley but NOT Veliz, Gray, Bergvall etc who would need to be registered and counted within the 23 players.
Sarr is not Club Trained and as an over 21 needs to be registered as Overseas Trained and counted as one of the 23 man squad..
We do now have more players who are HG (trained at clubs affiliated to the FA or FAW) than the minimum - and that can be accommodated by having fewer than 17 overseas trained players.
The key takeaway is that we do have more players in the squad that can be accommodated within the UEFA rules (if we include Spence) - so to allow us to register all the players, we need to offload 3 players and my suggestions would be Lo Celso, Gil and Solomon (members of last year's squad) plus Reguilon (loaned out last season).
