#2 It makes sense after Ambrose's departure

Dean Ambrose is set to quit WWE after WrestleMania.
The Shield reunited quite a lot of times in the last two years with a lacklustre rivalry between Ambrose and Rollins, which was sidelined due to Reigns relinquishing the Universal title. Roman Reigns could build upon the fact that Seth Rollins used his illness to rise in the ranks.
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Roman Reigns has been riding high after his emphatic return to the ring and proved it with a thrilling victory against Drew McIntyre at WrestleMania 35. WWE might opt to take the rivalry further as well, if WWE agrees to pay a huge amount of money to Brock Lesnar for another PPV appearance. This way, Roman Reigns can have a perfect end to his feud with McIntyre and Seth Rollins can defeat Brock Lesner in a way that brings a good story inside the ring.
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