The most incriminating text was McNally referring to himself as the "deflator". Also there was a text about Jastremski giving McNally a needle.
The timeline is curious, though. McNally refers to himself as "the deflator" smack in the middle of the offseason (what balls would he be deflating in May 2014, I wonder?!). The needle texts don't come until October, so that part didn't make much sense.
Also, I thought that the most incriminating text was the one Brady sent to Jastremski, in which he says that Dave [Schoenfeld, Patriots equipment manager] will come to pick Jastremski's brain -- and that Dave knows "it's unrealistic he [meaning Jastremski] did it himself". So this as a minimum establishes that something was done and that Brady was at least aware after the fact.
"FYI...Dave will be picking your brain later about it. He?s not accusing me, or anyone...trying to get to bottom of it. He knows it?s unrealistic you did it yourself..."
In Belichick's press conference, he explained how they tried to get to the bottom of how the balls were below pressure as all the ball were. They examined weather, gas laws, and how ball preparation could contribute. So, wouldn't it make sense to pick the brain of the guy who is in charge of ball preparation? So much of Wells report takes single text messages and heavily analyzes them while leaving out the greater context of the conversation.
McNally calling himself the deflator is the one thing that gives me pause. But if he was in fact deflating footballs, why was Jastremski expecting the balls to measure at 13 after the Jets game? That doesn't make sense. McNally also made jokes about blowing the balls up to the size of watermelons and rugby balls and made jokes about Spygate as if he was actively filming other teams practices and running out of tape even though tape isn't used anymore. We also know that Wells was leaving text messages out of the report that gave greater context as per this article.
http://www.csnne.com/new-england-patriots/wells-report-lost-text-messages