Brady isn't there to argue about science unless this goes to court.
Today, he's there to convince Goodell that he never told Jastremski or McNally to do anything against the rules and that Jastremski or McNally did not tell him that they had broken any rules during the long phone conversation or the meeting in the QB room.
If today turns into a debate over the science, Brady is going to have to make that case in court.
In court, the logic will be, "the science shows that nothing was done to the balls, so Brady could not have been involved in anything improper."
Today, the logic is "Roger, I didn't tell these guys to do anything against the rules and they have never told me they did so." Goodell either accepts that or he doesn't.
All the science stuff is a prelude to an argument in Federal Court. McPhee will try to establish that they will destroy the Wells report in open court.
As for Wells, he's an experienced litigator and will never admit that his report or the science behind it is flawed even if a Judge rejects his findings and criticizes the report in open court. That's not how these guys are wired.