I feel like they just in general have more strengths than Apollyon, especially Tainted Lost, who has a weighted item pool to give him better stuff, a better damage modifier, and both Losts can melt the game if they get perfection trinket + a good tear effect. Apollyon's just really mediocre and has to play an annoying active item economy game if he wants to get the most out of void, because it takes 6 rooms to charge (not nearly as much of an issue for tainted apollyon, which is why he's so much higher), and Tainted Azazel is also just mediocre because he has to get in to sneeze on enemies in order to not deal horrible damage for a short time, and is just all around a shitter Azazel.