No guild won GW twice on weeks when the same troop was awarded. Nobody should have any of their GW troops to mythic yet.
Or not... Last week, many people got double or triple rewards, and ascended Troglodyte to mythic. To my understanding, devs said it's ok to keep the extra troops and rewards, but surely there are people who aren't happy with this.
Making two lists, one with GW troops and one without, would mean anyone could diff the two lists and know the names of anyone who got triple rewards and kept them - after all, that's the only difference between the lists - and that's likely to make the players in question somewhat uncomfortable.
I would think to wait until at least 3 different GW troops can be legitimately made Mythic before making a list without them. Having one or two troops you can't get should not affect the list too much. Many people are missing some of the seasonal Imps, and have no way to get them now. I'm missing Autumnal Imp. Do you see me request a version without Imps?