#4 Aleister Black
The current NXT superstar would have been free this weekend and easily could have been called in to replace Roman Reigns.
Aleister is a completely different style of wrestler than we're used to, especially when compared to Roman Reigns, but considering there aren't a lot of stars on the Raw roster who could step into Reigns' shoes, why couldn't an NXT star be called upon?
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It could be argued that Black is doing well down in NXT and the company want to build him up ready for his debut in his own time, but this could also have been the perfect place for Black to have made an impact.
Black is popular in NXT right now and would definitely have gotten the audience reaction that WWE would have wanted.