Alise you pretty much nailed what each job contributes to the table in an instance. If there's a lot of movement in a fight and the boss disappears/jumps...bring a dragoon if you want melee dps and limit break. Also on a different note...,I initially refused to believe the "loldrg" stereotype but I couldn't help but believe it after seeing 4 out of 5 die alot in duty finder.