Luftstalag14
Culé de Celestial Empire
Lahm, Müller and Costa are not long-term solutions on the right wing since their strengths lie elsewhere. Robben is getting older and who knows how long he's going to be able to perform on the highest level. Adama would be a great replacement for Robben and probably would fit right in Bayern's system.
Douglas Costa played at RW more than midfield or LW at Shakhtar.
If you are right, for the exact reason you outlined, we should not sell him to Bayern.
Adama is a promising player, why should we be strengthening Bayern?
If it was Real Madrid who wants him, we wouldn't have even mulled the thought of selling him. Bayern should be no different.