I don't know anything about a AMG biography.
Not sure if this is at all a fully delineated story. Seems to me that Lion wasn't into reissuing already released sessions at that time, so I'm not sure what he would have done with the masters except release unreleased sessions he thought would be viable; don't think there were many of those available.
Anyway, I really like all the Transitions released and think Tom Wilson became an "okay" rock producer, but wish he could have stuck with jazz.