Stipe has pointed out before how vitally important both his losses were to his career. To (slightly) paraphrase what he said: the loss to Struve reminded him he was mortal, the loss to JDS reassured him he was elite.
The first was a prospect loss, a needed check. It's all too easy for a young fighter who has been bowling over the competition to assume it'll just continue that way, no worries. Losing to Struve was a brisk slap in the face that woke him up and focused him.
But if the first was a warning, the second was a tantalizing glimpse. It proved he could hang with the best; it seemed to promise that with a little more tinkering, he could BE the best. In that it was even better for him than if he'd won, because it spurred him harder to concentrate on working and improving himself.