Paxton is borderline a true #1; An Ace. A mid-1.2's WHIP just keeps him on the edge.
Miranda is a #3, with #2 upside. His FIP will always be a bit high, simply because he doesn't K 8 guys a game and he walks 3, but he induces weakly hit balls to makeup for it. If his K's jump, he's a #2.
Moore was a #4, in my book, when the season began, sans MLB experience.We just didn't give him the opportunity (until recently) to show it, outside of ST. In two starts he's show almost no downside of concern, the drop to #5 isn't preciptious, if that is all he is. but he sure shows a lot of upside. If Kuma was a 2, Moore has that upside, simply by adding a few more swing-and-misses. Moore has had 17 starts, at all levels, this season. In only 3 of them has he given up more hits than innings pitched. 2 of those were at the AA level. In 11 AAA/MLB starts it has happened only once.
Pick any #4 in the game and check on that.