Looked it up for fun:
Bears record w/ Sayers:
9-5
5-7-2
7-6-1 (Papa Bear retires as coach)
7-7
1-13 (Sayers hits 1000 yards anyway)
6-8 (Sayers rushes for just 53 yards in 2 games as injuries mount)
6-8 (Sayers again is hurt. 2 games, 38 yards)
Somewhat comparable to John Brockington, who came in right as Sayers was finishing up. Brockington became the 1st player to ever rush for 1000 yards 3 straight years, so the Packers signed him to a long guaranteed contract and his play vanished almost right away. He wound up traded a few years later, just to get the 150K a year off the books.