Christopher Hill points to the possibility of charlatanry involved in some of the events of the 1640s, picking up comments of John Pordage.
Pordage was (on his own account) in contact with Robert Everard for a couple of months in late 1649, which were filled with impressive conjuring tricks or illusions, and saw him experience a breakdown leaving him in Bridewell Hospital.
[1] Hill also comments on the generic nature of the conversion narrative of the pamphlet in which Everard's Catholicism was announced, and its lack of historical foundation.
[4] William Everard's career as a Digger leader, with Gerrard Winstanley, was quite short, beginning on 1 April 1649 at a hill in Walton-on-Thames.
The Leveller was a Trooper (called Buff-Coat while he remained anonymous) of the Lieutenant-General's Regiment, while the controversialist claimed an army rank of Captain (and was so identified by Pordage).