His mma guard has been awful. His jitz in mma has been just plain underwhelming. He's never subbed someone off his back he never sweeps he just locks up and tries to avoid damage. And hit guard is not nearly as affective at welterweight.
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How many elite fighters do we see submitted by somebody off there back? Its not BJ's guard its that frankly at an elite level the guard is virtually dead and has been from a long time.