Rollins brose and reigns got that wcw type gimmick to them..kinda like mongo's aura in horsemen mixed with steven segal and spread out over three people.
Zigs is more of a traditional gimmick. Apples and oranges.
If zigs was the 4th and also debuting then itd be apt but at the moment its too early to tell anything about their individual pushes..though it wouldnt surprise me to see two of them and a main eventer as the last three in the RR