This fact seems to contradict our intuition that modal verbs are not of high diversity with respect to a complementary set containing nominal words only, which are generated according to determiners.
we know that, at least in English, words are of ambiguous categories; therefore, those words of both nominal and verbal senses, such as 'consider' and 'help', are classified to the complementary set by determiners according to their nominal sense, but their existence in the complementary set also enlarges the diversity of modal verbs due to their verbal sense.