Xabi won't be this bad, there is no worry about that. But he needs to achieve a success by putting down his foot and deciding. If he keeps on this "we may sell that, we may buy this" method for too long, they won't be ready by the time season starts. He should decide who will stay and who will not, that way he can do a much better job with the team. Put down his formation, and names of players on who he believes should start, and then put down the bench, and then tell everyone that is the team.
If any players are upset about being benched, they can be sold, and someone else will be bought. And if any player at the starters is not good enough, they can get someone. But he needs to be decisive already and not be this confused any longer.
The team needs to act decisively during the transfer window. Xabi must take the right steps in this regard; the team is in excellent shape and needs to get even better. He needs to strengthen the squad further by making the right transfers.
If one of the team's key players leaves, they could suffer significant losses. He needs to make the right choices in these critical situations. Otherwise, a team that's performing very well can suddenly become very bad