The primary difference between the Cure series and Tetra is that Tetra is an off the global cooldown ability.
Cure I, II and III are specifically called healing spells and are on the global cooldown.
Tetra is labelled an "Ability" and is off the global cooldown. This I think is the primary reason it is not called "Cure IV" as it is not classed as a "spell" and is instead classed as an ability. It is the same reason Benediction is not in the Cure series name because it is an ability, not a spell. Tetra is basically a miniature version of Benediction. Also note that Tetra is not affected by Divine seal as divine seal only affects spells.

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