I think it is just a CB problem at Alabama, as your safeties are among the best every year.
I wonder if the problem at Alabama is the high turnover rate at CB. I mean, playing that position at a high level is one of the most difficult things asked of a player in this sport. And when a CB at Alabama gets good, they are gone. Rarely do they stay that 4th or 5th year. At other programs, CBs tend to stay longer and most won't even see their field until their junior season because it is so difficult to master.
So I went back to 2009 and looked at all the CB starters we've had. This is the list:
Kareem Jackson
Javy Arenas / Marquis Johnson
Dre Kirkpatrick
Dee Milliner
Dequan Menzie
Deion Belue
John Fulton
Cyrus Jones
Bradley Slyve / Marlon Humphrey
Marlon Humphrey
Anthony Averett
Minkah Fitzpatrick
Levi Wallace
Trevon Diggs
Saivon Smith / Patrick Surtain
Patrick Surtain
Josh Jobe
Jalyn Armour-Davis
Almost all these guys went on to play multiple years in the NFL. many of them are long time starters. Our CB coaching philosophy must being doing something right to get this many guys into the league.
IMHO, this topic pops up when we have a slightly down year at CB, which this was one of those years, especially with JAD and Jobe both playing a lot of this year dinged up. Honestly they just weren't really 'in-phase' as often as guys like Diggs and Surtain were. All being taught the same techniques, but some just have a bit better ability to execute that technique.