The Architect, a thread. After the events of WrestleMania 40, many people remember Seth telling Cody he'll be his shield back in February, which is exactly what happened. But there's another line in that promo that explains even more about his actions at WrestleMania.
For Roman Reigns, there are always two traumas that form the base of his fractured soul. One is his disastrous Royal Rumble win in 2015. The other is, of course, Seth Rollins betraying the Shield.
@MithGifs If the Bloodline turn on Roman as expected, then over time you can see Seth and Cody forgiving The Tribal Chief. Roman has formed a complex character. He was a legitimate champion. Now he is fallen. Rock created the mess he is in. Seth want his brother back. This will be big.