One of the strongest theories is that Greg is somehow in cahoots with Quentin and the “luxurious gays.” Once Tanya (Jennifer Coolidge) picks up the picture of a young Quentin and Greg, it’s clear that Greg is the straight cowboy that Quentin fell in love with and would still do anything for.
One of those things might be to find a way to extort Tanya from all her assets.
By feeding Tanya cocaine and an Italian stallion, it’s possible that her prenup with Greg could become null and void, as many do have infidelity clauses.
While the original plan may not have been to kill Tanya as many fans suspected, we fully expect at least one person to end up dead. Perhaps Tanya learns of their plot, and in a blind rage, pushes Greg or Quentin off a boat or a cliff into the water.