Tadic Haller Berghuis aren't gonna start in big games together. They lack pace. Antony blows hot and cold. If he's not able to beat his man he doesn't offer a whole lot, like in that Lille game last season.
If Neres is sold, I definitely think Sulemana would've gotten a lot of playing time. Unless I'm forgetting a player?
Regardless, it was a good decision by Ajax. Better players than Sulemana have sat their on ass on the bench over there and it would damage future deals if they gave assurances regarding minutes/starts.