Who stands on heels in the training stance with locked knees as KPM said? Do these people use the training stance as a fighting stance?
---This guy for one! His knees may not be clamped in, but look how far he is leaned back. His shoulders are behind his hips. His weight can't help but be back near his heels. And he got taken down, not because of his stance, but because he charged straight in on a grappler that ducked under his attack and took him down.
If he'd only remained in that static position, he might have stood a chance with the anti grappling.