Even if we sign Neymar there are rumors about Rakitic, Vidal, Dembele and Semedo. Even were all of them to stay the squad size would be 22 players not including Perez, Fati or Puig. That's not to mention Fati could always go out on loan now, the January window or future windows.
It seems Barca officials are in Paris and are negotiating a season-long loan with an option to buy which both deals will eventually reach 170 million. Lol, poor Coutinho being lost in all of this because no way he plays if they're able to get Neymar back to go with Messi, Suarez, and Greizmann. A lot of prima-donnas' in that lockerroom though.
A lot of prima-donnas who aren't necessarily prima-donnas and who have a proven track record of playing together and getting along. They have a Whatsapp group where they still communicate with one another and Neymar has even come back to Barcelona to visit his ex-teammates more than once. The only "wild card" "prima-donna" here is Griezmann assuming he even is one and he seems to be getting on fine. More pressing would be the quality of depth and subsequent wage bill considering the squad size. That being said there are still Rakitic rumors, and he's only played one half so far, Suarez getting older and his knees potentially still an issue, rumors of interest in Vidal, rumors of PSG interest in Dembele who is often injured anyway and a lot of fixtures in a lot of competitions ahead this season.
You keep bringing up the dressing room and "prima-donnas" when there's nothing to suggest it's an issue.