The third difference is that the root of good was primordial and did not have to be brought into being as a new creation, while the root of the Other Side was an innovation. The root of the Other Side is deficiency, which came into being only after the Tzimtzum.
This provides the answer to what seems to be a major difficulty. For it appears that evil has two places while good has only one. Let me explain: If we were to interpret “also this one against this one” as referring to the good and evil in the Sefirot themselves – i.e. what remained of the initial perfection (good) and deficiency (evil) – we could justly call the Other Side the offshoot of evil (i.e. of the deficiencies), just as we call the Holy Side the offshoot of good. However, this is not the case. For we say that it is the Holy Side in its entirety and the Other Side in its entirety that are “this one against this one”.