Your assertion about an "unsubstantiated opinion" has no evidence to back it up with regards to the article in question.
I have said it before, and now repeat this, hopefully for the last time. The Silver article says "people close to Brady feel the organization isn’t displaying much urgency toward ensuring" Brady is satisfied financially. The title is "Growing Disconnect." If the conclusion is the title, the premise in the form of this quote does not support it. That is basic logic. If you are having a hard time fathoming this, I do not know how it can be stated any clearer than that. If you know of some other inside fact in that story, feel free to quote it as I have read that story repeatedly and found none.
If the source said he was unhappy, or felt a rift between Brady's and the organization's objectives, that would support the conclusion. Put Silver on the stand under oath and ask him to state his observations as to Brady's posture on the contract negotiations and, if this article reflect his understanding, he would have to answer "I lack personal knowledge of Tom Brady's position." Speculation/conjecture.
If the story's accurate, the story's accurate, regardless of the perceived bias of the responsible author. Attacking the author doesn't change that.
You seem to be struggling with the concept of reporting opinions and reporting fact-based stories. The stories discussed of late are no more than individual opinions lacking a present factual basis. If you like the opinion, say so rather than claiming the story is a fact. If it meets with your approval, defend the opinion rather than relying on the story as a basis in fact. It simply isn't.
If an author like Easterbrook walks in with an opinion constantly hostile the Pats, he deserves the reception he gets. If you find his opinion, or that of any author who embraces a consistently hostile view, appealing, then you, too, have a right to your opinion. That is not "shooting the messenger" as that phrase is typically defined, as "messengers" carry facts, not their individual opinions. Opinions are from individuals, and individuals absolutely can be called to the mat on their opinions. And yes, opinions are likely always accurate as they reflect the personal views of the author. That does not mean those opinions comport with reality.
For example, Silver saying Brady had a torn ACL was a fact-based story from inside sources - this story relies on inside dope indicating the absence of movement on a contract, which could imply any number of possible occurrences other than the conclusion offered. That is pure opinion and conjecture, extrapolating from loosely gathered, potentially unrelated occurrences.