It's not about Bayern now is it? Ortega came here because he wanted to play for a top club. As he is a keeper with traits top clubs like.Wouldn't sell them a virus. Bayern can fuck off.
So he came to be #2. Now there is another top club who want him ( even if just temporarily) to come and be #1. This is hard to decline for any player.
Bayern really just have to pay the cost to be the boss.