The top ones were mentioned, Ill do some "scraps."
Million Dollar Man def gave Virgil his baby run. Virgil had a little "2" year run being at the mid card to lower mid card before just helping guys get over. Still, Million Dollar man helped give him the run.
Bret Hart def helped Owen Hart - Owen was a tag team guy lower card guy. When he beat Bret at WM10 it really helped Owen get into the upper card level.
Shawn helped HHH. I am sorry but HHH was a mid carder for life. When HBK made DX and HHH was a part of it, it elevated his career. It got him on the map. HHH was the guy who took the punishment for the Hall/Nash/Shawn/HHH incident and Shawn helped him get to higher mid card level.
Horrowitz never would have gotten any run (In WWE) without Skip of the Body Donnas.
Now this might not count but Ill do it neways.
Also Bret helped SCSA totally get over with their WM match. Would SCSA gotten over, sure, but I mean that WM match elevated SCSA to new heights. I also think Jake at the KOTR helped SCSA get into the mid card scene. Bret helped him just fly off the handle in popularity.
Some of these might not count again I was stuck with scraps :/ you guys named the best ones.