You’re right, the late Isaac Bonewits (1949-2010) was the founder of Ar nDraiocht Fein (ADF) in the USA. Ár nDraíocht Féin embraces a wide Indo-European “pagan spectrum”, I believe there’s quite a lot of Norse influence and that they also have elements of Celtic Reconstructionist Paganism in their outlook. Celtic Reconstructionist Paganism (CRP) “purists” tend to reject what they consider “inauthentic”, often found in other forms of Celtic spirituality. Having said that, Celtic Wicca, Celtic Reconstructionist Paganism, Celtic Neoshamanism and Neo-Druidism all share common threads and all influence each other – a great oak has many branches growing from the same trunk. Isaac Bonewits had a long and interesting life with various neo-pagans groups and movements in the USA.