I wonder if one of the advantages of having Kinsky in the squad as an alternative to Vicario is it allows Spurs to send Brandon Austin out on loan to gain experience - his last loan was to MLS in 2021 and he's only played a total of about 20 games in a professional league.
A good loan might allow him to double the number of professional games even in 2nd half of this season and it then makes his role as a 2nd or 3rd CT GK more credible.
We have a few decent u21 players out of the academy who are 'List B' for uefa squads (ie extra to usual EL squads) who might well become CT in time - Will Lankshear, Mikey Moore and those on loan including Alfie Devine, Jamie Donley, George Abbott et al.so Austin's CT status starts to become less crucial.
Worth remembering as well 21 year old Josh Keeley who is having a great season at L1 Leyton Orient, - probably needs another season (or even two) at a higher level club in order to compete for the no 2 position at Spurs, but unfortunately he joined Spurs too late to ever be CT, but he's currently by far the best youth GK. Kinsky joining Spurs allows Keeley to go out on loan.