I think it's just the latest fad which as usual is trailing the secular world. The first guy opens and he gets press, so then the next tries to copy him. When that guy gets press too more guys pile on in different cities. It's like the Subway fad a couple years ago, although hopefully this one will have better long term results.
It also helps that Texas BBQ tends to feature kosher ingredients so the dishes don't need too many modifications. I think the other trends you mention below are newer in the secular world, so we should expect to see them appear in the kosher world in another couple years. Maybe Mexikosher is that first place which will spark others.
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