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The devil is in the chemicals, the demons in the DNA, there's no ghost in the machine, the ghost is what is produced by the machine in it's functioning, we aren't minds expressing ourselves through flesh, but flesh projecting minds through it's expressions.

Look up philosophical zombies, and the chinese room thought experiment, also consider what makes you yourself by learning the parts of you that could be removed, and imagining your existence after each part's removal, so much of what you consider a defining trait of yourself as an individual is something you could conceivably find yourself living without.

Also note that after around seven years in your life, not a single cell in your body is one that you were born with, and every seven years every physical part of you is completely replaced by new components produced by your body.

Also imagine a teleportation machine that creates a perfect copy of yourself on the other side, but doesn't destroy the original you which enters the machine at it's origin, each version of you, new and original, are the same from their own perspective and from the perspective of their duplicate on the other side of the machine.

This is far more than just identical twins or a biological clone, it's an exact copy of everything about yourself, including all the information in your brain at the time of teleportation: every memory, personality trait, pattern of thinking and feeling, all things are 100% identical at the moment the duplicate was made, all the clothes worn and items taken with you are also copied in the exact position and nature as was at the entrance of the machine.

The other you doesn't share one thing with you, and that's the experience of being you, instead they have a separate experience of being themselves, your death will not end their experience of being alive as an exact copy of you, just as their death would not bring an end to yours.

Also the "exact copy" thing is only at the time of teleportation being completed, outside of that moment things start to diverge, as each of you have separate experiences that change parts of yourselves, you might even be brought to a strong difference with your copy through these different experiences and your gene-programmed reactions to them.

So you could say that under such circumstances, even if you go back in time to kill a version of yourself from five minutes ago, you and your most exact copy could be said to be different people for two separate reasons.

Now imagine uploading your mind to a machine, but it's just a copy of the data stored in your brain, obviously the part about your physical body doesn't apply here, but the mind uploaded could exist in the machine at the same time that the original mind which uploaded itself continues to exist in the physical body it was copied from.

Contrary to brain uploading being frequently sold as an unorthodox form of "immortality", that mind in the box is not you, because it doesn't get to experience being you, it only remembers your prior experiences before the upload and then goes onto "live" a wholly different experience of existing within the machine from the one you get to keep experiencing while truly living on the outside of it, if the uploaded mind gets deleted, your experience of living goes unaffected, if you die, it's experience of being "alive" is unaffected by it as well.

So, if multiple personalities exist, then you could count these as being different people, purely because each personality only experiences their existence while they are active, and even if memories from before the split occurred are shared, the memories after that point diverge to only include the experiences each personality has wen they are "out", in that way, an MPD sufferer is like a conjoined twin, one body, two (or more) different experiences of lives being lived within it.