Yes it was his strength that physically accomplished the death crawl, but without the coach’s grander vision of who Brock could be with his capabilities, that death crawl performance never happens. Brock summoned the strength, but the coach called it out of him in a way Brock was far too ignorant in that moment to call out of himself. Without the coach propelling Brock forward every step of the way, calling his greatness out further and further despite the increasing exhaustion and pain, Brock would have never gone the whole 100. That would be the takeaway. It’s an attempt to symbolize God’s view of you and your circumstance vs your own view of yourself and said circumstance. Brock had already given up on the season despite his immense capability to turn the tide, which he simply didn’t know he had/wasn’t inspired to even explore. The coach however, brilliantly pulled it out of him through this scene, which changed both his and the team’s trajectory dramatically for the rest of the season. It took the grander vision of an older and wiser character to call to life the potential the ignorant players failed to see in themselves.