Exactly. For a Steadfast MC, the Growth of Stop means they are holding out for something outside themselves to stop.
Although a Steadfast MC doesn't Change their perspective or worldview*, they do still grow. In particular, they grow into their steadfast resolve. The difficult events of the story test that resolve, and in so doing, temper it.
* Note they can waver, even go so far as temporarily change their perspective, before changing back. That's why for Resolve it's important to compare the MC between the beginning and end of the story.