The arrival of Aguero makes Barcelona has two advantages.
1. Barcelona does not need to spend money to bring Aguero to Camp Nou.
2. The presence of Aguero is the reason for Messi to stay at Barcelona.
They are not advantages, they are
reasons. Barcelona don't have money so they are all targeting players who are going to run out of contract this summer. Garcia, Aguero,and Gini all are. They are interested in Depay as well. Good thing that they had plenty of options who are running out of contract and had contacted them beforehand take Garcia for example.
Aguero is a great player, he's one of my favorite forwards in the last decade. The problem is that Barcelona doesn't have any money, their salaries are already at 110% of their budget and Aguero does not have any resell value.
Most of the recent signings are willing to work under salary lower than what they were paid for in earlier clubs. Gini had interests from Bayern but his wage demands were reported to be much higher than what he is going to get at Barca. (That's what I heard)
The deal for Aguero leaves a lot of questions, especially if the deal for Depay is true as well. Does it mean that Griezmann will be allowed to leave? They have Fati and Dembele there as well - with Dembele being offered a new contract too.
Griezmann on sale- could be possible. Reports are they putting Coutinho on sale and there were also reports about Coutinho being offered back to Liverpool. Let's see how it goes on.