You're missing the point.
Watch it again. It was lazy by the whole team. They ran the ball on tackle 5, there was no slide. The whole team was in a bunch. Matterson and Carty fell for the decoy. Then Brown went for something in between a ball slap down and an intercept. Brown didn't trust Carty to take Chinboy. Brown should have nailed the 19. That left Waqa marking the 19 running a cut back line, the sweeping fullback with his hands out in front AND Crighton.
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Yes middles should have shifted laterally, but in that play Yeo cock blocks Makka (?) and Fisher-Harris runs through the line and f**ks with Matto. It was a very good try and had nothing to do with Waqa.
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