Some dates on your Elias Champion and/or William would be helpful.
There's an Elias Champion 1714-1750/51 m. Mary Steelman, ch: Thomas, James,
Hazediah, Elias (1745-1810). Unless Elias 1 was born in 1710, because the
Champion book gives him two different dobs. Elias 2 m. Sarah Steelman and
was in Ontario Co. NY.
Elias 2 had a son Thomas b 5 May 1736 d 1808 who was a solider of the
Revolution.
Another Elias Champion and his brother Samuel moved to Florida. No dobs for
them, but parents Nathaniel & Mary Combe Champion born in 1690s. (I didn't
know there was a Florida to go to then. )
I didn't find a Micajah in the index of Champions in the Ruth Crawley
Champion book. Dozens of William Champions though.