Even though NFL.com's Jason Feller seems to think that it is, the daunting construction shouldn't modify verbs - it's an adjective. To quote from Feller's article: "Even the most casual fan knows of Brady's legendary exploits, but it is worth illuminating just how impressive he has performed throughout his career."
Would it look right if Feller had said that "it is worth illuminating just how impressively this performance was?" This is the same error, but in reverse. Nice work, dude.
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