Reva despite not being declared as a galactic legend, is referred in the community as a galactic legend because of how broken her kit is. By putting her in this galactic challenge, you have completely ruined anyone that doesn't have fully reliced rebels from completing a quarter of the challenges.
There is no literal way a g12 rebel squad can beat a g12 inquisitor squad with Reva because of how broken her kit is. It's absolutely tone-def for a challenge where the hardest difficulty has players saying "well I lost about 20 times, but my relic 9 raddus finally got me the win against the relic 7 inq team."
Pair this with the fact, that there was no reason for this change to the Malachor: Empire team.
Can we expect to see Wat Tambor, Malak, Starkiller, Jedi Knight Luke or General Anakin Skywalker replacing the worst component of other squads? Because this is ridiculous.