Well if... as you are saying you always AoE during mass mob pulls that will actually get you Coms.

If you've seen the thread about Tales from the Duty finder you will see multiple posts on people who sit there and single target rather than AoE in packs of 10+ mobs as if that ONE single mob is somehow more importantly than the other 9. Which puts ENORMOUS strain on the rest of the party. So that's one thing that will get you Coms especially from your DPS partner if they are doing it too. It makes runs go much more smoothly.

Secondly I can tell you a Samurai puts out enormous chunks of Damage so Samurai makes Boss Mobs go down much faster, especially in dungeons... just like a BLM does because there's generally not as much movement required in those.

So yeah I could easily see you getting a lot of Coms with Samurai.