Was that even a real quote? My guess was that he completely made that up.
He was close, not 100% but it was a pretty close paraphrase of it.
The Actual MLK quote:
The ultimate measure of a man is not where he stands in moments of comfort and convenience, but where he stands at times of challenge and controversy.
What coach said:
The greatest measure of a man is not in the way he handles times of comfort, but in the way he rises with controversy and challenge.