Just got finished playing the second round. Almost all the other players were Tour Pros, ranging from level 64 - 88. I did not say "my opponent" as I do not look at Showdowns like that. For me, it is just trying to birdie one hole at a time. I do not care what the other person is doing. In fact, I hope we both kick azz.
I also think, at this time of day, and given the coin room the Rookie level uses, there were, in fact, some Tour Pros that played like you would normally expect. The higher-level ones were very good. Looking at the stats and seeing very few ranked rounds, I would suggest they play primarily in the coin rooms, and practice rounds, for the most part. They would still rise in level, but not in Tier. I see this a lot with mobile players who do not have the capabilities to arrange, and select, games as the non-mobile.
Just the way it is. All you can do is play your best and not worry about who you are paired with. IMHO