So theres a certain thing people are missing here with his contract situation. The big thing to me that I have noticed is during a interview done a few days ago, Dana said Vince is allowing Brock to do this fight. If Brocks "last contractual date" is Summerslam then he should be free to do it regardless meaning it ending at Summerslam like all the reporters are saying is bullshit. He probably signed a regular contract for certain amount of years again and they are keeping the details super hidden to sway people.
Contracts are a little more complex than that, my man. Especially multi sport ones worth millions.