#4 Dean Ambrose
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As of right now, Ambrose is still out on injury and is expected to be back by SummerSlam this year. Now, this is assuming Rollins is still champ by then and he should be, a feud between these two will be great.
Just like what was said about Balor, Ambrose should do the same. Dean had gotten stale as a face and a heel turn will do wonders for him.
He's already insane and seeing him even crazier and doing heel tactics would be great to see. This is assuming WWE pulls the trigger on Ambrose turning heel.
Rollins and Ambrose have great chemistry together. Their matches from the last few years hold up and it really showed that these two deserve to be where they are at.
If Rollins is still champ by the time Ambrose returns, this would be great to see right away. Ambrose returns and immediately turns on Rollins to set up this feud. Book it WWE!
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