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Let me start by saying I don't disagree with a locked front knee being an odd choice for most sports motions.  Here are some comments about how you might incorporate a locked front leg in a pitching motion to generate power, though I would certainly defer to the crowd if they seem off.  First, the front foot plants below the back foot, so even with a locked front leg you still get significant forward weight transfer.  With a short stride, the power generated in a pitching motion must come from the waist up in large part with the primary source of torque being hips, to shoulders, to arm.  Snell is rather upright in his motion -- the antithesis of the Seaver motion where the back knee drags on the mound.  So he must be using some other kinestetic method to generate power.
Let me phrase my point in the form of a question; if a pitcher were not allowed to make a large stride while throwing, what would they need to do to generate torque and power?