What I find interesting is in my opinion Willie took his time reacting to incidents and let the match flow rather than booking everyone in sight (that spirit of the game mechanic) and I enjoyed his refereeing more.
And I agree with this however regularly (especially in the championship games I attend) he is very quick to his cards rather than letting the game breathe - there is no eventually getting cards out which is what I was impressed with this weekend. He referee'd the game much better this weekend compared to other games.
This is the expectation now for a top level assistant referees (not linesman). Headsets make this a lot easier now, but the AR must get involved if they have information for KMIs. The days of "I call the fouls and you take care of offside" is long gone. An example from MLS last year is the trail AR (at the halfway line) calling a clear PK out of the centers line of sight. It was unusual, but the game needed him to get involved.