None of them will be Mythflox level as they've actually learned from that (though they really should've learned from AK...), but one of them will be a bit quicker than the others for sure. However, we could end up with another Hunts situation where 4man dungeons become entirely irrelevant for capping the new tomes/getting Soldiery/etc. as quick as possible. Gonna guess Snowcloak since it's a story dungeon (assuming they all give equivalent tomes), though.