Also? This doesn't just happen with bound base elements! That is just total nonsense. A replaceable <e> can happen on free or bound bases, as well as on suffixes, and so can a potential <e>.
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A kiddo's grown-ups are responsible for loving them, and that love should keep us all together, on the same page, working for the child's best interest.
The suffixing patterns are flexible, because their most important job is marking the morphological family that the word belongs to.
The brute memorization of a list of spellings that require an < -es > variant is both inelegant (no need to duplicate <z> and <zz>, for example) and incomplete.
Just some more evidence that the Facebook groups and their understanding is really neither here nor there.