No idea.
My speculation would be that Suttner's loan out was a try-before-they-buy and Schelotto was perhaps in a bit of conflict with the club.
My further speculation is that although U21, Gyokeres was counted as a squad member, and that the U23s were deemed good enough in general to not need...
There is no reason to believe Tony holds a vote. If a manager makes a good case for a player, within the budget maximum, there is no evidence to suppose the club would insist on an alternative.
Yes, I doubt it. Seems very unlikely to me.
Of course there are some players above budget the club would never sign, but other than that it is much more likely it is a collaborative rather than confrontational process between the manager and the rest of the recruitment team - and the manager...