In response to my post on this:
For many years now, I have fed them outside their tank (they share a 60 gal), each in a separate feeding box. Originally, I'd take one out, feed the other, then switch them, but Darby is a biter and I got sick of dealing with that, so I started feeding them in separate boxes.
Many people suggested that I should separate the snakes to cure Darby's biting problem.

However, for the first 2 years of his life, Darby was housed separately and had that problem when it came time to feeding. He smells mouse and he becomes an agressive, strike-at-anything biter - always has been.

Since he was like that when he was alone, how will separating them now fix that issue? And, is it really that much of an issue?