Interesting point.
The way I'm looking at it after today is this: if you're choosing our best midfield, it's probably a three with Gorrin at the base and Brannagan in one of the two positions in front of him. That means the final spot should go to whoever best fills that final position and complements the other two. Given the options in our squad (assuming everyone other than MacGuane is fully fit), that means it's one of Kelly, Sykes, Henry, Hanson, Forde and maybe Lee. Of those, Hanson obviously isn't really trusted there, Henry isn't really dynamic enough to play a full 90 minutes in that engine room, Lee is preferred out wide (and might have the same issue over 90 mins as Henry). Sykes I think has been great there individually recently, but as more of a midfield collective, today we just seemed to have more control of that midfield than in other games recently. I think if him and Brannagan play together, you sacrifice a lot of control of that central area, together they're not positionally disciplined enough. Which leaves Kelly and Forde. As the poster above says, we did just seem to pick up more second balls and have more space in the middle today. That can't just be chance.
Different opponents and situations will demand different combinations, obviously. But it seemed today like Kelly brings out the best in both Brannagan and Gorrin, which can only be a good thing for the team. And given the way Brannagan seemed so liberated playing alongside Kelly, it's not unreasonable to conclude that playing alongside him also released MacGuane in the same way.