#4 To protect Brock Lesnar and The Fiend
Both RAW and SmackDown have new champions, with Brock Lesnar having won the title on SmackDown's debut on FOX last month from Kofi Kingston, while "The Fiend" Bray Wyatt defeated Seth Rollins at Crown Jewel to win the Universal title for the first time.
RAW and SmackDown seem to have fresh starts with a new roster, new sets, commentators, and a new broadcaster for SmackDown. WWE perhaps want to build both their champions, Lesnar and The Fiend, and not have either of them lose so early in their title reigns.
Although they are not on the same brand, Lesnar or The Fiend losing could dent their credibility. Both titleholders need to be pushed and look strong, before a new Superstar comes along to feud with them, which would add more to the respective titles as well as the Superstars.