How long before they get sick of being "under the maw" of Texas?
You obviously don't know what Texas is about, if you think it would attempt to lord over the other secessionist states.
But regardless of what Texas does or doesn't do, other states wouldn't want to be just an appendage of somebody else's new country, so unless Texas itself is split up into smaller states, I can't see Oklahoma or Kansas or Louisiana wanting to be the tail of a very large dog.