If an annointed is disfellowshipped, then another person is annointed to replace them. If the annointed is reinstated, they are annointed again (or still).....So what happens to the replacement?
I recall an article stating that when a person becomes annointed, they receive a spot in line. They used the example of giving out wristbands that they give out at concerts. If they get out of line, they can later get back in line at the same spot by showing the person behind them their number (138,123 would be in front of 138,124, etc.).
So as long as the person gets back in line before he or she dies, they get in.
Rub a Dub