I’m going to start this article by answering my own question.
Short answer: No.
Longer answer: Maybe, but probably not, and if it was a mistake to let David Moore leave then the Seahawks would have probably re-signed him by now (given the fact that he’s sitting at home watching NFL games on TV).
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Full transparency: I originally started this article 4+ months ago when, as part of a larger discussion in the Comments section of a random article, jlrhino asked how many teams had a more productive WR3 than Seattle did last season.