You ought to take a real close look at those names of the Alamo defenders, which begins alphabetically with that of Juan Abamillo. Quite a few were Texans of Mexican origin, and fought and died just as bravely as those from elsewhere. And you'll find their names well remembered by those who admire such courage, in Texas and elsewhere as well.
They did speak English, as the besieging Mexicans complained they could not understand them.
Studies show that of just over 200,000 persons not native Indians living in Texas at that moment, only 4% were Hispanic, and those were white having come from Spain directly to Texas without any time to intermarry with Indians.
Seguin is the one most often mentioned.