And BTW: just because some office gadfly says something is so, doesn't make it so.
When a person goes to the media anonymously with a piece of juicy negative info, that usually means that is a disgruntled employee. A good loyal would never do anything to intentionally harm the organization; and anyone would understand that such a piece of info inherently is harmful. So it is best to take it with a grain of salt. But the media of today are like Piranhas: they all jump over one tiny piece of meat even if they don't know quite what it is.
It is near to impossible to hide a bad, toxic relationship in such a public environment as the NFL for three losing years.
Perhaps Snead and Fisher weren't fishing buddies. Perhaps there wasn't 100% agreement on the way forward. But that doesn't mean that there was downright animosity between them that leads to dysfunction.
I don't like stories like this because it is just another way to pile on and make hay while the sun shines. And unless Fisher or Snead verifies it, there is no way to know it's veracity. To this point they both deny it.