Warmaster Horus
Explorer
Sorry, my original answer was really more on the availability of most of the scenarios. Probably less than 10 percent of the total player base will ever play an EPIC or Author only scenario, so I tend to respond with more general information.
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I've played in an Epic and an Author-only scenario at Tier III, so yeah, we exist. I know several other players who move through Tier III doing both AL modules and hardcover gaming, too. It would be cool to push those PCs to Tier IV in some way, just for personal satisfaction's sake, but I think the game framework in both AL and D&D in general, may need to mature a bit more before doing so. In any event it's not on my must-have list for AL by any means.