We'll see, often times guys coming off these catastrophic injuries aren't fully back until year 2, so I think we could see an improved version of Dak next year. Much of what you described out of Roethlisberger we've seen out of Dak at times, he just went into a complete hole towards the end of this year for a number of reasons, some of which were his fault, some weren't, so we'll see.
His movements just were never very fluid at times this year and I think that bled down into his mechanics and footwork in the pocket too. I have no idea how much, or any of that can be contributed to the injury, but he looked different and there were times where he just didn't look comfortable or confident in his movements.
We'll see, but that 4 year contract could end up being a blessing if this is the permanent Dak, skittish and gun-shy in the pocket and all.
Another thing as far as this particular game, someone said SF weren't getting free runners at Dak and he was just holding the ball too long. That is true on a few plays but they had free runners coming at him almost immediately several times, including on the first sack on the first drive of the game, as well as on the sack that came right before the INT.