Based on Ancestry trees and what seems to fit, I 'think' perhaps
Edward Riggs, IV
is the same as this Edward RIggs. I sent a request to the profile manager to make it public. It's definitely too old to be a private profile. But it seems it would 'fit' for these to be the same person. Maybe they couldn't add to the line because the field is locked, so they just created a private profile. I don't know....