My guess is Williams and Jackson were moved FOR the start of spring. Chris Jordan will most likely remain at linebacker for the rest of his Bama career.
It was rumored that Scott will make a move to defensive back, but it didn't happen during the bowl practices and hasn't been announced yet. I personally believe Scott's position in spring drills will depend on the number of receivers we sign in this class.
That's my thoughts, but I've been wrong before.