There won't be any direct entry commands on the 757, any of our pilots who do it will be experienced Captains or more junior FO's who have 2-3 years to go before they have the hours for a command. No senior FOs will bid for it because they won't want to get stuck on it while commands go to people below them.
PS. We don't even know that we will be flying it yet but it looks very likely although I can't think why they just don't bite the bullet and buy 2-3 757s and be done with it, it's clearly the right aircraft for the job.