TL
Well yes the Soviets ability to mobilize manpower (for use in army and other sectors) was something the Germans never had, and a big part of winning the war. You aren't the only one who has studied history at an academic level

(although I did switch to archaeology after just a couple of terms)
Thanks for clearing up the terminology, I was way off on my reply then.
Anyway I was referring to a more tactical level and the problem when looking at numbers at a purely operational or strategic level. And that the soviets insistence of dividing up attacking divisions into two regimental echelons meant that even if on paper can look like a soviet division of 6 000 fighting men attacking a german division of 4 500 fighting men where numerically superior. (and ofc in a way it is). But on the ground this could be a whole different matter.
I took your terminology "forces in presence" as in units engaged with the enemy at the tactical level and "forces committed" as all units committed to that objective, regardless of whether they where in at the front or part of the second regimental echelon.