Actually, the small ring gives the most force because of the tremendous leverage, assuming you are climbing something steep enough to put some load on it.
If the load varies during the pedal stroke, as it surely does, it only stands to reason that it would be more worn at some points than in others.
It is controversial but I favor adjusting cup-and-cone bearings with a little bit of preload, just so you feel a very slight lumpy drag when you rotate the spindle or axle in your fingers, because it spreads the load over more balls. No preload lets the axle or spindle sag a bit under load, and then only one ball is taking most of the load.
Say, Asi, what do you mean to tell us by using the sign over Auschwitz as your sig?