I do not think IH will get much mileage out of their counter-suit about the VT, and being ripped off. Clearly, TD says he "felt" they were taken advantage of, but neither he, nor Vaughn understood, or knew, exactly how so. Pleading in their defense, that they did not have good engineering advice available to them at the time, will not not get them far in a court of law. Especially so when they are asking that Rossi return their $10m based on that.
But who knows, after the jury sees the incriminating evidence against Rossi, they may throw IH a bone, and at the least TD/Vaughn will have some Miami Beach condos to party in for their troubles.