Useless rolls

[Yinnyth]

Allies Roll has one powerful situational use - Meikyo Shisui. If you're ever in a fight where SAM 2hrs are a key part, you might kick yourself for not having this one. Not the first priority, as it does cost a bit and use would be rare, but it could come in handy.

Drachen is also situationally powerful for SMN Astral Flow, and is great for unusual PUP nuking situations.

Having used Allies Roll several times on my corsair in order for me to close a powerful SC on Melo Melo by closing a darkness SC with a 5k damage wildfire, I can safely say that Allies roll does almost nothing. You'll average somewhere around a 15% increase to SC damage, and since SC damage is based on the damage of the closing WS, you're better off using rolls that will just boost BOTH the WS damage, and (by extension) the SC damage.

Drachen roll is a little bit underwhelming as well. Rolling XI with DRG job bonus will get your pets 16 MAB (and magic acc), though it's much more likely you'll roll a 7 or 8 without a DRG in the party, meaning you'll get +1 or +5 MAB for the pet. Granted, you might someday find yourself in a party with SMNs spamming magic WSs, or PUPs using the mage body, and in those situations the choice of rolls you can make is somewhat limited. But you're much more likely to find yourself in a situation with RNGs who want courser's so they can make full use of their weapon's aftermath.

To be fair though, there is untapped potential with CORs + SMNs which would require the use of DRG roll. It would be possible to have a COR in a party with 5 SMNs, have the SMNs astral flow, pop an ether, the COR uses random deal, SMNs use astral flow, pop an ether, COR uses wild card, SMNs use astral flow, pop an ether, cor uses random deal, SMNs use astral flow. It gets even more confusing with more corsairs, but 3 CORs + 3 SMNs would produce even more damage.

[Anza]

you're better off using rolls that will just boost BOTH the WS damage, and (by extension) the SC damage.

What pair of rolls would you suggest that would increase SAM WS damage? Chaos, yes, unless your SAM is already capping attack. Fighter's for a chance of double attack, versus a sure Skillchain bonus with Allies. That's it really. I'd personally probably go Chaos+Allies for a Meikyo-centered strategy, or Fighters+Allies if Atk is capped.

And yes, that doesn't much help the rest of the party. But if it was an NM or mission type fight you could certainly do Allies on the SAM only, Chaos on everyone, then Fighter's or whatever else on the other DDs.

I'll admit it's very situational, but when combined with Sekkanoki and/or Dusty Wings (and stuff like Shikikoyo from a 2nd SAM, mixing in a Meditate, Wild Card reset), a Meikyo Shisui using SAM can fire off a lot of consecutive SCs. All of them getting a COR roll boost is fairly potent stuff. It's not as if we've never seen Meikyo Shisui strats before - Nyzul bosses, Snoll, Tenzen, etc. Wouldn't surprise me to see them again on Voidwatch NMs or some other new stuff.

Does it make the Allies Die worth the price? Maybe not. But I wouldn't go so far as to call it "useless".