The Guard is looking incredible. They're showing off as a really strong team, and I almost guarantee they will qualify for groups. I am super excited to see how they will stack up in a tourney with these stronger teams.
XSet has been tier 1, GenG was tier 1, but not sure anymore since their performance in VCT.
V1 was tier 2 and qualified, but didn't really defeat any tier 1 teams to qualify imo.
As for 100T I think. they should be considered tier 1 until proven otherwise since they still have the same core 3 that led them to success.