Never been an issue in practice, either when a buddy has motioned for me to go ahead of him or when I have motioned for a buddy to go ahead of me. Frankly, if you and I were diving together and I motioned for you to go ahead of me, I doubt that you would be confused or have any issue.
Just recently, a back-mount buddy and I made our way to a progressively smaller area of cave. Myself diving side-mount, *and without discussing it beforehand*, I decided it was time to let the back-mount guy go in front to decide when the cave was small enough for him to turn the dive. After a momentary hesitation, he got it.
In practice, even with newbie buddies, when I have motioned for them to go ahead - no muss, no fuss. YMMV.
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