Full Idea
By 1680 Leibniz had clearly abandoned the 'whole entity' conception of individuation, for a conception grounded in substantial form alone.
Gist of Idea
Leibniz moved from individuation by whole entity to individuation by substantial form
Source
report of Gottfried Leibniz (works [1690]) by Daniel Garber - Leibniz:Body,Substance,Monad 2
Book Reference
Garber,Daniel: 'Leibniz: Body, Substance, Monad' [OUP 2009], p.59
A Reaction
In other words, Leibniz became more of an Aristotelian, and more of an essentialist.