You're completely right, Daggerfall. Without weather(sand) support Excadrill is very likely to be picked off easily. I would without doubt say he's my second choice for elimination. However, Ho-Oh is somewhat frail and can really only sweep with sun and the ability to heal (roost, regenerator, etc). In addition, may Pokemon in the tier pack an electric move, and there is prevalent use of stealth rock. Ho-Oh is a good Pokemon without doubt, but I just don't see it pulling off a 6-pokemon sweep.
"I feel like I got hit with a Dracula, by King Kong." -BMO