Here is another comparison, the best eight year stretch for both pitchers.
Morris 1979-1986 115 ERA+
Appier 1990-1997 140 ERA+
Appier's ERA+ in the 90's was 131 (min. 1000 IP), seventh best in all of baseball. That ERA+ would have been good for fourth in the 80's, third in the 70's, fifth in the 60's, third in the 50's....well you see where I'm going. Appier was a great pitcher and unfortunately due to his time in KC vastly underrated. He never got any huge cash advances like some.
Likewise Morris, often called the 80's best pitcher comes in 30th in that decade with a 109. Behind such phenoms as Britt Burns (113), Bryn Smith (110), and Steve Rogers (110). He also trailed Bud Black (111), Danny Jackson (111), Mark Gubicza (118), and Bret Saberhagen (128). But hey he was better than Charlie Liebrandt (108), whatever that means. So Morris at his best was nowhere near the best. That 109 would've ranked 38th in the 90's, 33rd in the 70's, 31st in the 60's, 28th in the 50's - again nowhere near the league's elite.
I'm certainly not campaigning for Appier to be inducted, I just happen to think he's more worthy than Morris.