But this capacity also exists in a singular sperm/egg. True, the sperm/egg requires assistance in order to mature into a sentient being (namely a counterpart egg/sperm with which it can fuse, in addition to a uterus etc.), but at the same time the zygote/embryo also requires assistance in order to mature into a sentient being (namely a uterus etc.).
namely a counterpart egg/sperm with which it can fuse,
Zygotes differ because they already contain all the instruction that they need to grow, as a diploid cell. This combination differs from the parents, unlike that of the sperm or the egg.
It is true, that by themselves, zygotes will not grow, as they require nourishment and shelter, no different from any other person. Deprive zygotes of either, they will die. Deprive newborns, and they will die as well.
As for percentages, things happen to born people as well. The failure of the zygote to implant, or to grow and develop, will usually come from either errors within the cell, or other extraneous factors.
We can discard extraneous factors, because they have no bearing on the personhood of the zygote.
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