This is where it gets hard to parse. How much of the entire game's playcalling was an effort to protect that calf? His one big run cost him as he was even more immobile after it. In Dallas in the second half, moving more seemed to limber up his leg. In Seattle, it seemed to get worse from a movement standpoint.
The 35 is the most commonly cited yard marker for FG range, not including game and kicker conditions. So I don't think changing the plan at the 36 is far fetched at all. They have done it before immediately after entering scoring range.