Yup.
That’s one of the things that makes tracking and sequencing so dangerous. The biggest problem is when novice players try to use advanced techniques like these. They often end up making mistakes or not doing enough research and betting big when there are no aces to be found.
However, keep in mind that the ace is worth much more to the player than the dealer. An ace gives the player over a 50% advantage while the dealer only gets about a 10% advantage of each bet. It is therefore very advantageous to raise your bet even if you think the dealer might get the ace because it will not hurt you nearly as much as it helps you.
You don’t. You might know that the ace you are tracking will come out in the next 9 cards (or however many cards you have calculated). You can then spread to multiple hands in order to increase your chances of getting it. Other times you will expect the ace to be the 9th card (or whatever) but you know that you might be off by 2 cards in either direction. In that case you could still try to steer the ace to your spot(s) and away from the dealer.
In short, anytime that you know an ace has more than a 1 in 13 chance of appearing you are at an advantage. The more accurate players will get a bigger advantage and suffer less fluctuations than the novice players.
-Sonny-