Aubameyang who came on a free transfer was an advantage for Xavi who was building his team at the time and with the arrival of Aubameyang at least Barcelona had the right replacement after losing Messi, even though he joined in the middle of the season but he could adapt quickly as Barcelona goal machine, so if indeed later barcelona failed to get lewandowski of course they still have a striker who can be relied on next season.
I am not sure. I mean if they already have Aubameyang at striker position that helps a lot. Then why would they need Lewandowski this year? Of course Lewandowski is a better player and nobody argues about that, but when you already have a good player, you do not try to get a great one instead, you find a position that is not great and try to get someone there.
I always said that bulk of their problem is defense and midfield, if they really want to get someone then they need to get players there. Defense in particular is terrible and if they could get some young stars for that money, that would be a lot better for their future, instead of an older striker.
maybe between Aubameyang and Lewandowski is just for comparison in the team. If only Aubameyang there is nothing competition for the position, that will not good for building the team and the future. Lewandowski is enough experience as an attacker and it's very good for them, especially for that position, and not only as a great goal scorer, he will be good for sharing knowledge with a young players.