Yeah, I do like the idea of retooling/repainting moulds as new characters!What I like about the idea is that someone at Hasbro is actually putting creative thought into their retool/repaints! We all know that Hasbro benefits from repaints because they get more "bang for their buck" with what they invest into developing new moulds, but we also know that seemingly random or pointless repaints (e.g. Bumblebees!) are about as appealing as being slapped in the face with a live trout and end up peg/shelfwarming. But thoughtful repaints actually give a impetus for people to buy the toy! These are the kinds of repaints Hasbro should be putting more focus on instead of doing all their random repaints that don't sell.
P.S.: Skullgrin's not really obscure - he had a prominent and repeated canonical appearance in G1 and G2 (and later in Dreamwave and IDW). I agree that Axer is pretty obscure though - never had any canonical appearances during G1/G2 or DW -- only ever made a brief "hi then bye" appearance in IDW's Spotlight: Arcee