found somebody on reddit who had scanned back all the way to 1974 and this was the full list of 3+ WAR months they could find
including the last couple days of May, Pete's at 3.7 fWAR his last 29 GP.. i've only been able to find one 30 GP stretch that beats this:
in fall 1992, from 8/25-9/26, Barry Bonds reached 3.8 fWAR in a 30 GP stretch (sporting a .600 wOBA)
HM: in summer 2024, from 5/15-6/16, Aaron Judge reached 3.4 fWAR in a 30 GP stretch (.393/.504/.972)
put another way, i'd argue that this is the closest to the "build the perfect player" exercise that we've ever seen aside from Shohei, perhaps; leading MLB in AVG, OBP, SLG, Def, .. 3rd in SB, t-5th in BsR
the heat map demonstrates this fairly well, too