If you read the reddit post it says you can pick two classes on the same rank at different times.
Example (The bold is if you pick that class what options you’d have for the next rank)
Rank 1:Cleric
Rank 2:Cleric C2, Priest, Krivis
Rank 3:Cleric C3, Priest, Krivis, Bokar, Dievdirbys
Rank 4:Priest, Krivis, Bokar, Dievdirbys, Sadhu, Paladin
Rank 5:Priest C2, Krivs, Bokar, Dievdirbys, Sadhu, Paladin, Monk, Pardoner
Rank 6:Priest C2, Krivs, Bokar, Dievdirbys, Sadhu, Paladin, Monk C2, Pardoner, Druid, Oracle
The last patch in kCBT has changed the class advancement system. Now classes are no longer locked away from you.
I.E If you’re Cleric, and decide to go Krivis, in the future you can still become Cleric 2 or Priest.
Time for new builds.