Before the description of the touches, it states clearly:
After the second touch down the copilot commanded "Go-Around" and increased thrust. The captain confirmed "Go-Around! I have control" and took control of the airplane, pressing the override button, to perform the go-around.
Meaning that at all points it was (or should have been) clear who was in control at any given time, so mechanically-linked yokes would have made very little difference.
I had a quick look at the graph and couldn't find anything relating to roll-rate at first glance. Like I said I'll have a proper look later.