Aziz does not mean exactly two people in every generation. Its routes may expand: two at one stage, three at another, and five later. The decisive point is that transmission does not narrow to a single person at a relevant point.
Pattern A: Two at the first stage, two at the second, and four independent narrators later—consistent with an aziz structure.
Pattern B: Two, then one, then ten—an intervening solitary narrator introduces tafarrud.
Pattern C: At least three independent narrators throughout—more naturally the structural pattern of mashhur, provided tawatur is absent.
These are illustrative analytical patterns. For real hadith, the identity of narrators and independence of routes must still be established.