On my posts about Sal Trapani's ghost pencillers, I figured he knew most of them from their working together at Charlton. I suspected the same sort of thing applied with John Severin's finding a ghost for this story from Cracked 70 (Aug/68). "Snow Flake and the Seven Dwarfs" is signed only "Severin" in his handwriting, and only the regular Cracked artists are listed in the masthead. I wondered where he could have known this artist from, and figured it must have been when he was drawing at EC; this penciller was the colorist there.
All kidding aside, Marie Severin would have her pencils inked by her brother, with both credited for the first time, a couple of years later at Marvel on Kull the Conqueror. There may be more examples of this ghosting at Cracked, but an awful lot of its issues are hard to come by nowadays.