#2 In-ring talent

Being of giant stature often limits one’s ability inside the ring. In the case of Sullivan, however, it doesn’t seem to make a difference. He is quite athletic for his size and isn’t shy to go on the top rope to smack his opponents with a diving elbow or a headbutt.
On top of that, he has a variety of body slams in his arsenal and is also quite agile within the squared circle. If he feuds with Rollins for the WWE Universal Title, the pair could bring out A+ matches due to their in-ring talent.
#1 Brutal character

The persona with which Sullivan made his entry on the main roster has been brutal. He growls like a wild animal, breathes with vengeance and has a menacing look on his face.
Everything about his character is terrifying and he is the perfect antithesis to the persona of Seth Rollins right now, which is why they are going to complement each other so well.
Becky Lynch has been challenged HERE.