I've talked about this before. I think the best physiological/biomechanical explanation is that the back leg action [post contact] is a REACTION to the upper trunk's [arms/bat included] angular momentum.
https://twitter.com/thefarmsystem/status/1475935030199439366
Said another way: It is a function of the distal component [the back leg] attempt to create greater gyroscopic stability, ie., as the as the trunk leans forward and as the arms/bat go "out and around" to get to the low/outside contact point, the back leg tries...
....to "offset" that action by essentially reacting in the opposite direction.
I assert this based on both biomechnical considerations [gyroscopic stability] and drills I use wherein the constraint is that of hitting with almost all of the weight off the back foot ----from a squared up foot placement.
A novice will almost always attempt to "stagger" the back leg foot. Because intuitively this makes sense as regards creating better dynamic stability to set up a swing.
Bottom line: It is a REACTION to the postural dynamics typically in the context of a low/outside pitch location and a relatively closed lead leg and/or stance. And I should add that only a relatively few elite level hitters react [typically] in this manner
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