While he's not irreplaceable, it's still a loss. He's well regarded. Here's an excerpt from an article of 25 op future HC candidates under 40. Whipple was listed at 15:
15. Arizona Cardinals Passing Game Specialist Spencer Whipple
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Whipple has established himself as a trusted offensive mind with the
Arizona Cardinals, where he's been coaching since 2019. Initially brought in by Kliff Kingsbury, Whipple was retained on the new staff under Jonathan Gannon last year. He worked with All-Pro wide receiver DeAndre Hopkins over three seasons (2020-22).
Now, he is part of the group guiding a young and talented receiver corps in Arizona, featuring Marvin Harrison Jr., Michael Wilson, and Greg Dortch. His skills were recognized when he was selected as the wide receivers coach for the West team at the
Shrine Bowl earlier this year.