#2 Roman Reigns
If Roman Reigns wins the Universal Title at SummerSlam in his match against Lesnar, there could not be a better feud for him than against his 'brother' Dean Ambrose.
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Ambrose and Reigns, storyline-wise, have been much closer to each other than Seth Rollins. This Brotherhood could be an important factor in this rivalry.
The heel-face dynamics for this match could be very interesting. On the same night that Ambrose returned, Paul Heyman faked an offer of becoming the client for Roman Reigns.
It could be foreshadowing the future. If Reigns joins hands with Heyman to defeat Brock Lesnar then he could be the heel going into the feud. If Ambrose turns on Rollins in his Intercontinental Title match against Ziggler than he could play the bad guy.
The possibilities are endless!