Literally no one of the people you mentioned should be in the main event except for maybe Joe
What do you think they should do?
IMO, it is time for them to try with their full-time talent. Half those guys have proved in NXT that they can handle main event prorams if used right and to their stengths. Nobody is ready for the main event unless you give them a shot. Kevin Owens wasn't ready for a program against Cena in 2015 but they tried and it worked. What's the worst thing that can happen?
And you only say Joe is ready because they gave him a shot in 2017 against Brock, else you would also say he was a geek who loses all the time (Ricochet beat him a month ago).
Give Seth some feuds with new guys and try to get them over and build towards a program against the Fiend down the line (Maybe at Mania).