Thanks for the added info. I was thinking there must've been variations of the same recordings that were not Bluesbreakers or something but then he writes that they were released so he's probably just gotten it mixed up, or the person he wrote with did. It does come across as though there were only three players at the session(s) mentioned who would form FM a few months later but I guess it wasn't quite that way or as significant as alluded to. I know, it was that perm that addled his brain!
Keith Hartley, who later had his own group, replaced Mick in the Bluesbreakers; could he have come in afterwards on those tracks? That would at least make some sense of Mick saying he was at the sessions for those titles. If Aynsley Dunbar was there it would mean he was at sessions before he was in the group, or that he wasn't there at all never mind playing on them. I don't suppose he could have mimicked Dunbar being quite a different style of drummer...