Robert Echyngham, Esq. - Robert de Echyngham, no authoritative fully sourced genealogy?

There appears to be confusion between the different Roberts in the family in various research documents.

There is the book Echyngham of Echyngham which appears to have errors:
https://archive.org/details/echynghamofechyn00hall/page/n35/mode/2up

There is also a document Echyngham Medieval Family 1100 - 1850 by Charlotte Carpenter Smith, which appears to have errors as well:
http://www.medievalgenealogy.org.uk/families/Echyngham.pdf

Regards,

Joshua M Swerling