While nodding off today, it occurred to me (as a result of some comment I half-heard uttered from my teacher) that “Mark of the Wolves” refers to Terry’s jacket, or at least to the star emblem on it (thus the large star in the game’s logo). Terry was the “Lone Wolf”, and since he’s trained Rock and passed his place, and if not specifically his jacket then a very similar one, off to the kid, I guess Rock is therefore the new “wolf”, so to speak.
A wolf named Rock. Hm.