You are correct, the Christ, or the Word, or the Primal Will is not a person, but does manifest itself in human form.
Baha'u'llah was the manifestation of the Christ (or Christ consciousness if you like) in human form. Jesus Himself said He has come from heaven, indicating He is a human representation/manifestation of a non-human, non-physical Reality.
You cannot equate Jesus and Baha'u'llah to other human beings. They accessed knowledge that no other day to day human can access
If you have evidence of others having such knowledge, please share the writings of these "light workers" and we can investigate this claim for ourselves, otherwise it's just a claim you are making, which itself is a brainwashing approach.
