This is something that can be interpreted in various ways, first of all for lifelong Barcelona fans, they know that Busquets is a key player to win and it gives him more stability and he can have or exert more pressure in the game, Xavi They have a lot of players that they bought a long time ago, they have to use them because otherwise they would run out of options to face the greats, they also have Real Madrid breathing close and Man United.
But what I believe is that BARCELONA has fought so hard, I don't think they are going to let themselves win now in these games that are so crucial, Barcelona is in the Europa League for the second time in a row, the fans deserve to be there at UCL.
I agree that Barcelona will try to do their best to win, and they have players to replace each other, and they have a manager that can change the tactic to suit whoever they have, which is a lot better and could work well for them. I know it is not going to be easy, and I know they rather have him in the long run, but it's going to be not an impossible task to get someone else to play there and do as well as they could.
We have seen them play so many different players this season due to injuries, and they still do so well, which I believe they will be capable of doing some more, be great at La Liga like they have been all season, and give United the hardest game of their season.