I'd be inclined to keep the same thing going from the start and adjust as needed in match. McKenna in for Tierney and go again.
Wonder if we will tweak to be more like a 343 with Tierney out. I noticed that from about 35 mins we were sort of playing 4321 with Ralston playing ahead of that 3 as more of a right winger rather than wing back and Hendry sitting at right back. It was mostly in possession rather than out of where we reverted to the 5.