Because Gilchrist was working on the strip when GoComics began. He even wrote the web site on the artwork (I own several pieces – mostly for Fritzi). It’s more trouble than it’s worth to go back and scan/digitize all those older strips that few people will bother to read. The Gilchrist stuff was always there, so it’s no trouble at all just to leave it.
Never thought I’d long for the return of “Olivia”…