I have a question. Since every class gives Weapon Specialization for at least a few weapons as a bonus feat at level 3, and Versatile Specialization requires Weapon Specialization as a prerequisite, doesn't that mean that every class can choose Versatile Specialization at 3rd level?
Assuming all 3 character levels are in the same class, yes. A character with, for example Soldier 1/Envoy 2, on the other hand, could take Weapon Specialization: Heavy, but could not take Versatile Specialization.