What if it's "arranged" (or just poor management if you're less cynical) such that FOs in the company cannot gain the experience required to be become a commander?
Just guessing - I don't work for Bristow, but if you need Captains now - and your FOs will take too much time and effort to get on-line, then just side step the FOs and find requirements only existing Captains can meet.
Prob. solved - for the company... Then again, maybe I'm completely wrong about Bristow and it's just some other operators that do such things
BG.