I think it means that Leonard was unconventional and unpredictable, in a restless sort of way. He didn't stick to a consistent formula. The latter refers to this second quality..
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RayHYou've certainly found yourself a dense, obtuse, and confusing bit of writing here. One might say pompous if one was feeling uncharitable.Well, Ray, what did you expect? I find it most humerous and ironic that the author is on the National Book Critics Circle board of directors