Or Simms ain't all that
But the point of the U23s isn't to win, it's to build players that contribute to the Everton first team. Playing Niasse, who isn't (and shouldn't be) in the first team picture, contributes nothing to the cause.
Brands needs the autonomy to sack Unsworth and rebuild the academy system. His expertise matters. This is a thing that Dutch clubs tend to do better than English clubs.