This seems to be less a "who should replace Len as head judge" thread as a "who should replace Len full stop" thread.
Seriously, does anyone truly believe there's a real need for a head judge other than to decide the dance off result in the event of a tie? Other than that, what is the point? What more do they do than the others?
Well, apart from receiving some general toadying from the presenters, have a pointless "lens" (Craig's camera, Bruno's binoculars and Darcey's... nope, can't think of anything - she's out, don't have quite the same ring do they?), interrupt the others and shout at the audience like some risible pantomime villain obviously.