This seems rushed and hurried. Every angle leads to you being a Temporal Agent, it should have coincided with a Temporal Recruitment Event, period.
Additionally, the Veteran Subscribers, much less Lifetime Subscribers such as myself deserve to be able to create Liberated Borg or Talaxian Captains, regardless as to the faction. Borg can easily be explained with anything temporal. The highly limited faction and race choices with Yesterday and Discovery are a step backwards in my opinion.