[He doesn't say anything to the first part. As for the second part...]

Among us Roidmudes, there are those who have managed to evolve further than anyone else. Those who have reached their Ultimate Evolution. For his plans, my creator needed four of these Ultimate Evolutions.

Because of the nature of what he is, he himself counted as an Ultimate Evolution. Then there's me. And then Medic.

[Three out of four. Almost all of the promised number.]

...All he needed was one more.