The boosts that Mundi gives to those characters is intense. 10% of their max health as offense is pretty huge when some of them will be pulling max health over 100k. The point was for Mundi to take characters that aren't very good and make them viable.
If you check the requirements on LS Geo TB, you can see multiple zones that require just Jedi to use. Essentially this means that at some point Mundi plus some of these council members will be enough to do that mission.
Suddenly QGJ might have another use as a leader. His zeta adds a ton of speed, so in addition to Mundi's speed boost (and the offense boost from QGJ's lead) you're going to have a sneaky good team. Time will tell how good, but I think they will be at the very least a really solid team.
The complaint would be that the team is missing a good taunting tank, which Kenobi would fill that role, but he's probably better off in other squads. So maybe that Mace rework will happen and he could be that tank.