There were 2 possible outcomes from the investigation:
"yes there was abuse"
or
"we didn't find anything wrong"
How would the league look if Ted Wells spent 3 months investigating and ended up saying "We didn't find anything wrong"? They would be chastised because the media had already convicted Incognito and friends in the court of public opinion.
Therefore, there was only one possible outcome from the Ted Wells report.
So basically, since you have already eliminated the possibility that the Wells report could have found Martin at fault, and the only possible outcome is that the locker room was toxic, we should probably just ignore the report?
Consider the following alternative outcome:
"We could find no evidence of discomfort from Martin prior to his demotion; in fact, his inappropriate text messages with Incognito were usually initiated by him, and consistent with his messages to other individuals outside of the Dolphins organization. We were also unable to corroborate Martin's claims that this was a widespread problem in the locker room; the inappropriate communication was almost entirely between Martin and other players, primarily Incognito."