cadence issues

I have a smart trainer which also displays a virtual cadence.  I noticed that the graphic riders in the game all seem to use the same cadence as me.  Every leg motion is in sync.  Why is this?  Shouldn’t the leg motions reflect the actual cadence of each rider? 

I believe it is more accurate if you are using a cadence sensor such as the Garmin GSC-10. I use one and when doing low/high cadence drills my avatar responds accordingly.