Do i have to max out every skill to be able to add next job skills?

I'm missing 5 SP on my Bishop.

And one warning: the SP assignment checks that you have at least 61 (or 67) in 1st job, 121 in 2nd, 151 in 3rd.
It *should* be checking that you have 61 (or 67) in 1st, 182 (or 188) in 1st+2nd, 333 (or 339) in 1st+2nd+3rd.

If for some reason you decide maxing out the last 2nd job skill is more important than some 3rd job skill - you can't. Any extra points in an earlier job come out of your 4th job SP.

I'm not sure whether you can still do it when levelling up normally.

Aww, rats. So this means us NLs will be stuck with having 11 points in 3rd job worse than useless shadow meso instead of using it to get a longer 2nd job booster duration.