Hi David,
I think
@CharismaticLady has not asserted sinlessness, rather, that there are deadly sins Christians do not commit, but others sins considered transgressions, such things as were covered by sacrifice under the OT Law, that Christians may still commit.
@Episkopos , on the other hand, I believe you've got it right. That he teaches the person who is "in Chirst" will live completely sinlessly, even experiencing by the physical senses the celestial realm in some sort overlayed onto this realm, though he himself does not claim to live this way, but claims to have done so in the past.
I think there is a dramatic difference in their points of view, one being that some minor commission of sin may occur in someone who is in Christ, the other that since "in Christ is no sin", any commission of sin is because someone is not "in Christ".
Considering that the blessings of salvation are "in Christ", we are a new creation "in Christ", and so on, not being "in Christ" is not being born again, not having adoption as sons, these are really very different points of view.
Much love!