How to classify each Job.

[KDSilver]

Ninja has one combo with 2 different finisher indeed. But it's more a priority job than a pure combo job like drg.
You have to setup your suiton into trick attack and everything surrounding your burst windows which is not on your main combo.
Using your mudra frequently and refreshing your huton.

Sam is what we could also call "combo based" indeed, but it uses it to both refresh its buff and open its sen.

It's think jobs can't be classified this way.

Same for dancer.
Its both about proc and prority.
Dances, gcd proc, forced oGCG proc, feather, saber dance
Usage depend on your gauge, the buff aligment, if you're overcapping...