Well, no need to say more, the title tells it all. Can Gotrek, the most famous Slayer of the Old World, be the general of an army? His Leadership of 10 would sure be useful.

Felix and Gotrek are a REGIMENT OF RENOWN! They aren't characters (per se), but a seperate unit altogether!
So, your answer is no. Which makes sense, anyway: Gotrek's primary concern is finding terrible monsters and Grobi to slay, not leading a bunch of whiny manlings.