We also are researching that line, and did find the connection a few years ago of Anthony to father Nicholas. I will try to find that source again. The RAST family on Ancestry claim that no only Anthony, but also a John Hilliard (our ancestor) who came to Vg. Colony was Nicholas' son, but I could never find that source. We know that Anthony and the Vg. Hilliards were somehow related but there's just not enough info yet. I will let you know if I find that source concerning Anthony who came to Plymouth.
Sincerely Cheryl Davis Hilliard