In our interview class, we had 2 offered the conditional letter on the grounds that they take the RJ course. One had 550/85, the other 400/60. It all falls on the Captains Review Board to make the final decision on who gets hired unconditionally and who gets hired.... well, conditionally. When HR called one of the guys to tell him his file had passed, they told him he would need to attend the RJ course because he hadn't flown in the past two years. So, it could be for many reasons, not just low mult time.