When the cards are dumped from the carousel slots to the discharge ramp, I don't think it's possible for them to be placed up to one card from the front - I think by the nature of the mechanism there must be a minimum number from the front (although I've never had that confirmed).
It also raises the interesting question that if the same applies at the back end of the discharge ramp - let's say the cards being dumped from the carousel can never be placed further back than 6 cards from the rear - then it would be tantamount to (six) cards never coming back into play?
I did have a chat once with a dealer in a casino that was all CSM - he went on at length how it made for a fairer game yada yada, and I explained my concerns re the above. I asked if he'd take the casing off and I'd show him what I meant, and we could watch the thing working to see whereabouts in the discharge ramp cards were introduced. Not surprisingly, he declined.
Something I think players should have their concerns satisfied over me thinks?
If 15 cards are dealt to a full table (sixteen in the States), and the furthest forward cards can be introduced to the ramp is six from the front, then yes, it would be possible for cards just returned to the machine to come out in the next round. But if the ramp is always kept at full capacity (which I suspect it is), then no it wouldn't.