What you keep ignoring is that over half of texas has never favored secession and would fight it tooth and nail. Among Latinos that opposition is virtually unanimous. Only among white hardline conservatives do you get close (but not quite) a majority favoring secession.
So a seceding Texas would lose at least a third of its land and population and look like the third map I keep pointing to.
And that's a formula for civil war, chaos, and a nosediving economy.