In that case, I'd argue that Wysocki doesn't really belong in the discussion either. Schusterick got his three USDGC titles in a span of five years (2010, 2012, 2014). Wysocki really only broke through for a Worlds title in 2016. He was battling at the top for a couple years before that (his playoff with McBeth in 2014), so his "peak" has lasted about as long as Schusterick's, at least so far. And of course, neither guy is done.
That's what makes it tricky to have these GOAT discussions about players still in the midst of their careers. We only include guys like McBeth and Wysocki and Schusterick in this discussion because our history is so short, there just aren't enough players to really fill a top 10 all time greats without including still active players like them. Unlike say, MLB, where it would be folly to discuss top 10 lists and include guys like Mike Trout or Clayton Kershaw. Sure, they're on track to be among the best ever, but they can't be compared yet to the full careers of Babe Ruth or Hank Aaron or Ken Griffey Jr.