Sheffield United's 3-5-2 'Overlapping Centre-backs" Approach

So, someone sent me this link yesterday demonstrating Sheffield United utilising two outside CB's overlapping down the wings in order to create overloads in the field. Quite odd, really, but fascinating.
Chris Wilder is the coach who's taken them from League One to second place in the Championship and pushing for automatic promotion.

I can't embed the video due to it not being Youtube. Here's the link, however, with the video contained within....

Sheffield United's 3-5-2 'Overlapping Centre-backs" Approach