Aubameyang was doing so well as an Arsenal player before his controversial move to Barcelona back in January though I supported Arteta's decision because as a leader you are expected to lead by example not giving other players the wrong impression and example to follow. He's currently doing well at Barcelona. With the club's decision to sell out players I hope he stays and helps the club.
Sure, we must respect the decision made by Arteta. Aubameyang is a good player but he may not fit under Arteta's management. There is no problem with Aubameyang's skills, he is always a sharp and productive striker. But we don't know about his attitude, Arteta may feel his attitude will bring a bad impact on Arsenal squad. So, it is wise if Arteta lets him goes.
I didn't expect this to happen, Barcelona especially the manager doing a good job to sell Aubameyang to Chelsea. I'm not sure Xavi make the wrong way, but from what I look how effective Lewandowski is on the front, Sold out Aubameyang is a great step for Barcelona back to what they did before. I don't care if he is back like on Barcelona, but if he stays on a good hand, Aubameyang could be better in Tuchel's scheme, or not possible for Chelsea to create again Lukaku v.2