#2 Who will be the Special Guest Referee?

Arguably, the biggest question heading into Stomping Grounds tonight has been that who will be the special guest referee for the Universal Championship match between Seth Rollins and Baron Corbin.
This past week, we saw Rollins lay waste to every aspiring referee for the match by viciously attacking them all with a steel chair. With no referee finalized yet, it does seem like WWE has a huge surprise up their sleeves for us.
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There have been speculations of the Beast in the Bank, Brock Lesnar ,taking up the job, but with Baron supposed to name the referee, it does not make sense for him to choose Lesnar for this job. Paul Heyman is another name that has been thrown into the mix, and while the advocate mentioned on RAW that he would not be the referee, you can never trust him, right?
There also have been some out-of-the-box speculations of Bray Wyatt being the special guest referee, but the chances of that happening are very low. Who do you think will be the guest referee tonight?