Probably freezer burn as I freeze chicken all the time and it looks similar to that if its been frozen a while.
Speaking of woody breast, I have been getting that a lot recently with the Tesco fresh chicken breasts. It used to be like one pack in 10 would have it in a couple of the breasts, but recently its been every pack and most of the breasts. I have started getting the Tesco slow grown, which is more expensive for less, but so far they have been great.