Yeah, almost all the text message stuff is really weak. If McNally was illegally deflating balls all season, why was Brady playing with 16s against the Jets? And if they only started manipulating the balls in the wake of the Jets game, what does it matter what McNally called himself six months earlier?
I do think, reading through the science, that some (but not all) of the pressure readings of the Patriots' balls suggest they were not at 12.5 to start the game (even assuming best-case scenario with respect to the gauges). Whether they were tampered with (vs just Anderson saying "close enough" or another explanation) is another matter. It's worth noting, the amount of tampering would be really small, for the most part - the most "off" ball was less than 1 PSI different than what would be explained by the Ideal Gas Law. The average difference in pressure drop between the New England balls and Indy's is ~0.7, and roughly half that can likely be explained by time differences. If the Patriots did tamper, it was something like taking 0.5 PSI out of half the balls, which is pretty shitty tampering.
One funny thing I noticed: the ball D'Qwell Jackson intercepted measured at 11.45, 11.35, and 11.75 on three separate readings, which raised the red flags in the first place. This shouldn't have raised red flags at all, because it's in the 11.32 to 11.52 range that is entirely explained by the Ideal Gas Law. If the NFL officials understood physics, they never would have bothered measuring the New England balls.