I'd push back some that Lolich wasn't good in '68. He wasn’t used as much (in fact made 7 relief appearances - which I have to say I don't remember at all) and "only" completed 8 games so Mayo was taking him out of games earlier than later in his career. He was credited with 17 wins but the Tigers won 24 of his starts. So counting totals maybe weren't as high, but his peripherals were mostly quite good. His K rate was the 3nd best of his career and his FIP was 2.99 which was well better than his average FIP of 3.2 while in Det (which discounts his poor last years in SD) and only 0.34 off his career best, his WHIP was third best of his career, hits/9 was the 2nd best of his career. His ERA+ was below 100 -- but 68 was a pretty nutty year for ERA across the leagues. His raw ERA and FIP were better in 68 than 69 despite his 69 ERA+ being 119, so I'd argue it wasn't Lolich's performance that was the difference in ERA+ as much as the league itself being the outlier in '68./
Down the stretch from Aug 1, McLain's ERA was 1.85, Lolich's was 2.39 and in fact in Sept. Mickey's ERA (2.27) matched McLain's (2.29) across their last 6/7 starts. It was not a surprise Mickey pitched well in the Series (of course the 3 CG was), they were 1 and 1A by that time. The surprise was McLain didn't pitch better.