...so "else" is just indicative of equality.
No, indeed it could well be suggestive of inequality.
It's indicative of difference, "someone else" is not the person or people currently referred to.
The man wants to be like someone.
Could make sense if we take "someone" to imply "someone of importance", much as somebody is used in "You don't understand I could've had class, I coulda been a contender, I could've been somebody... instead of a bum which is what I am, let's face it." from On the Waterfront (and indeed the scene in Raging Bull where he quotes On the Waterfront). This though is a different sense of someone to how it's used with the else; in the same sense he already is someone, so we need the else to get the real sense of the statement.
Someone created that control mechanism.
This is now close to a non-statement; of course someone created it. "Someone else created it" tells us that it was not created by the person/people/company who are the current focus of discussion (if there was no such focus, then it would mean someone else other than the person making that statement).
Because difference allows for inequality, then contrary to your statement about equality, it could be used to reflect inequality. (Inequality entails non-identity [not being the same thing or person] but non-identity does not entail inequality):
Maybe someone else can understand this.
Suggests that someone else might have the knowledge or deductive ability needed, but the speaker does not, so that "someone else" is not equal to the speaker, they're superior in this particular quality.
Maybe someone else would do that, but I couldn't do so in good conscience.
Suggests that the hypothetical someone else is morally inferior to the speaker, or at least would make the moral decision on different grounds.