You said he wasn't a great LB because he didn't stop the run. You need multiple players to stop the run. No one's making up a fake argument. Even if Von was the best run stuffer in the game we'd still need a ILB to do that. Also, we have another OLB who is good against the run in Chubb. It doesn't mean we don't need an ILB to do that.
Or, in short - you started off almost saying we need an ILB to run stuff because Von is deficient and then switched to saying well we still need an ILB to do that. Von isn't deficient, and we need an ILB to run stuff (also and more importantly to cover) but not because of Von's being deficient.