I've never heard of a "Shadow" from ECW either. So yeah, if most people don't remember them from ECW, they shouldn't be promoted as such.
The only way "ECW Original" should be attached to someone on a promo flyer is if they were featured prominently in the old TV show and/or PPVs, such as Balls Mahoney, Shane Douglas, Ian or Axl Rotten, etc. But for example, Rockin' Rebel..I dunno him and thus I can't judge him 100% but if he was in EASTERN championship wrestling more than EXTREME championship wrestling..and he wasn't all that known or featured during the huuuuuge drawing period of ECW then promotion of "ECW Original" with his name isn't all that noteworthy. Just sayin..