This might be of interest:
http://familytreemaker.genealogy.com/users/m/a/r/Kathleen-A-... .
Basically, it says George came over as a servant to Samuel Winsley who was from Colchester, Essex. It says they came over together. Other writings I have found regarding the witch hangings suggest an immigration date of about 1639. I'm not sure if this helps, but I think it puts the nail in the coffin for me.