I don't want to be too specific as to what our capabilities are, nor what kinds of magic any of our Companions might wield. To look at him, for example, Waymar hardly seems a mage, and while Tyene is a powerful healer, that is only one facet of her magic. At the same time, despite both of them having quite a bit of prepared spells remaining, it could be a mistake to share that Dany and Rina are Clerics who could have seriously depleted themselves in the previous battle. Being vague could cause them to be wary, or to make incorrect assumptions should they choose to double-cross us.
I think my plan speaks to our strength in a nebulous way, without giving away any kind of specifics.
[X] "Well met, Yrten Sword-Sunder. I must admit, the Golden Wind is truly an impressive vessel. Rarely have I seen its equal." We can flatter you so hard your brain dribbles out of your ears, but we'll rein ourselves in for now. But be aware that we find your ship pleasing to the eye, and should you attempt to double-cross us, it will make a fine addition to my hoard. Addressing the Tiefling Mage, "Greeting, Wisdom, we have not yet been introduced. I am known as Scalathrax Ashbringer."
-[X] "My retinue and I have just returned from translocating three Efreeti Turtle Vessels, captured by sword, spell, and claw less than an hour ago, to my realm far from the Plane of Fire. Although two were taken completely intact, I regret our enthusiasm was too great for the third to withstand. Still, I am certain my vassals are capable of salvaging something of worth from its broken keel."
--[X] "The Efreeti overseers were slain, of course, but the remaining crews seemed quite amenable to entering my service."
---[X] "I believe our credentials speak for themselves, yes? And what of you and your crew, Sword-Sunder? A fine vessel and skilled crew does not necessarily make one capable of successfully taking a Devil-crewed treasure barge."
-[X] Varys will relay to us the pertinent information she is able to glean using Mindsight, including the number of Intelligent crew members, and whether there are any Efreeti or Devils aboard.
-[X] Ask of Yrten what he knows of our prey, its crew of Devils and other malignant beings, and whether or not it has escorts, and how many.