All potential bonuses

Oh so really i should read it as

epic primary = unique secondary

correct? Cause the comma throws me off instead of an = or a /

Really that does make much more sense since those values have to be equal.

Now do we actually have concrete evidence that once a slot bonus is one of these statuses, it is stuck like that forever? aka a 21% to one stat/multiple stats [disregard %all] can never achieve a 24 or 27%?

nope a 21% can still go 24/27 and once you achieve 24/27, next cube will most likely get it back to 21% cuz the chance of getting a primary stat on 2nd and 3rd line is very low

If you wanted HB, you could make lvl 26 common pants with it, then wear an overall on top and the skill stays in the skillbook, I'm pretty sure it's a glitch but still.
About the "level" requirement for the skills, it's char level right? because a friend got SE on lvl 80 gloves.

Now this level requirement is very confusing, some people says its the item level and now this one SE on a level 80 gloves!