I posted this in another thread about Earth-1985.
While John Stewart is serving as GL, Hal eventually separates Carol from Star Sapphire (at least for a spell). Guy is still brought in as a full time GL.
After Hal becomes GL again, he rejoins the League. John leaves Earth and assists Katma with patrolling sector 1417, eventually paving the way for a GLC series set in space.
Guy sticks around as a thorn in Hal's side on Earth. Guy goes on missions with the JL when Hal is unavailable (causing all sorts of fun drama).
I really do think John should have left Earth to join Katma, and return as occasional guest stars. Plus, have arcs where Hal visits & assists them. During the Englehart run, John was a totally different Lantern than Hal, and after the crisis, should have went his own way. I think putting so many Lanterns on Earth was not feasible, long term(which modern stories have shown). IMO, John just filled in while Hal was gone. During that run, John talked about leaving Earth after Hal's return.
The only Lantern who should be tied to Hal, IMO, is Guy. I think Guy's origin (and angst) is more intertwined with Hal. Plus, Guy established ties to other heroes. All of John's ties are with the GLC.