User blog comment:SolarMist/Limit Breaking and Skill Levels/@comment-24273554-20141223233745/@comment-17760674-20141224005313

All three questions: yes

You can think about the +2 skill levels like this: +1 from the extra 5 levels due to limit break, and +1 from the duplicate daemon being a duplicate daemon (and this duplicate does not need to be maxed, btw). They are separate boosts. ^^

The +2 skill levels thing itself is not some sort of special feature exclusively for lv.85 -> lv.90 limit break. It's a regular thing, formed by the combination of two different boosts: +1 from the extra 5 levels, and +1 from the duplicate daemon being a duplicate.

The special thing is the skill level limit, which goes up by 1 for 70 -> 75, 75 -> 80, and 80 -> 85, but then goes up by 2 for 85 -> 90.