I was the Guild player for Yorkfaux. We played the winners on the top table in the final round. We lost our first round to USA then won 3 to be beaten by Krakowball.
I played Nellie round 1 , and Justice for the rest. They are my main masters normally, as I've not been playing guild long. I swapped from gremlins for this GG season.
Justice worked well vs Asami in Symbols of authority, and beat Marcus in Public Executions. She also did bad things to Nellie in a guild off in round 2.
I lost hard in the final vs Hamelin due to a really bad decision to give my opp the choice of deployment. He had a shooty crew and the terrain screwed me.
Can't say much about other Guild players choices as I was concentrating on my own team.
I will point out that the format meant you know what master each player is using before building the crew. That tends to force players away from masters that can be countered easily. If you know you're playing Hoffman, you're going to take anti-armour etc etc. I think Nellie is probably not just one of our best masters, but also hard to counter.