why even cast Lon Chaney?

I watched iThe Mummy's Ghost a few hours ago, or rather the last half, and for some reason I noticed the physique of Kharis; and he didn't strike me as all that large, as in boned. It obviously was not, could not be Tim Tyler, but egads! Chaney strikes me as a much huskier guy than the dude in the mummy costume. I know that a guy named Eddie Parker often filled in for Universal players in horrors back in the day, not sure how tall or large he was. To me, Kharis looked like a stunt man. The face, such as I could get a sense of its size and proportions, didn't look Chaneyish, either. No, I wasn't looking for this in particular. It just dawned on me in the close shots (I don't mean close UPs) of Kharis. Maybe they used Lon for some of the earlier scenes and a few of the major ones later on, but in the scenes that actually had the mummy moving around, walking, climbing, carrying Ananka, I didn't get a Chaney vibe, and when he's in a major role I usually do. He was a very physical actor. The Kharis I saw moved well enough, didn't vibe, to me, as Chaney. Just my two cents.