I'm probably totally wrong with this but just thinking back to the stars of the Attitude Era and the RA Era. The Rock, HHH, Stone Cold, Y2J, Benoit, Mankind, Cena, Edge etc etc all worked their way up, or had several years history in the industry before joining WWE. There's only two men that I can recall who were pretty much catapulted to the big time from the get go - Angle and Lesnar but at least they were both legitimate amateur wrestlers.
I agree mate, E&C, Shawn Michaels, Rock, Austin, HHH, Y2J, Benoit, Eddie Guerrero and hell even Cena all started as mid card, tag team or IC champions, it was the level between the triaining plant and the top.
Right now i would have something like this:
Tag Team:
Goldust & Stardust, Uso's, Team MizDow, Outlaws (for training young talent on screen), any two from the new day group (kofi & Langston), Dudley Boys (if D-Von joins)
IC: Barrett, Wyatt, ziggler, Rusev, Swagger, Cesaro,
Heavyweight: Kane, Show, Lesnar, Rollins, Cena, Orton, reigns (now he is rumble winner), bryan, Bully Ray (if he stays), HHH.
Anymore i have missed out that you would like to see change or join a certain group ? We need more stables to have a bit of gang warfare inbetween, they can also branch into single or tag team divisions.