1) I think Kessler put it correctly. Brady should have handled the phone situation better. Even though Wells had told Brady he would not be penalized for not handing over the phone, destroying the phone was a mistake, based, as Kessler observed, on bad advice from Yee. The smart thing to do would have been to give the phone physically to Kessler as his Lawyer rather than destroy it. Yee should have suggested something along those lines. As far as I can see, this is the only mistake that Brady's team made throughout the entire matter. While the mistake was related to "appearances" and not to substance, nonetheless it was, as Kessler observed, a mistake.
2) He did allow them full access to his phone records and to the records of the texts he sent as well.
3--6 were never sought, as they would be reasonably be argued as violations of Brady's Constitutional rights in this case and, as such, would have been fought vigorously by Brady's attorneys. But even the NFL in all its absurd arrogance wasn't dumb enough to demand them.