[Beta 2.0] Captain Level Progression Tree?

[Vision-138]

I have not see this yet with my own Captains but was wondering/suggesting.

Do the Captains eventually move up Tiers with enough levels and what are the thresholds?

I think I saw somewhere Tier 0 Captains become Tier 1 Captains at Level 5? 6? I don't remember now. However, what/is the threshold for moving up from there? Will my Tier 1 captains ever become Tier 2s? or 3s? or should I be dismissing them as soon as I find a Tier 3? 

Bottom line "Is it worth investing in my existing Captains?" or not?

 

Thanks,

Jason