In 86 it was defense that let them down in 2nd half
In 87 it was Flutie throwing away game
In 89 the 49ers were better team ,, Home game didn't mean anything when looking at rosters
1990 and 91 teams were not very good teams ,, Vets were starting to decline and only a few young guys (Carrier , Woolford , etc) were productive
In 1986 the Bears scored zero second half points.
In 1987 Flutie wasn't even on the team.
In 1989 SF was better, but getting crushed at home 28-3 is not exactly to Ditka's credit.
In 1990 they were again crushed 31-3.
In 1991 they were again a home favorite and lost. Of course they weren't as talented as the 85 team, but they were favored and they lost.
And none of this addresses that the teams the Bears lost to were able to win with mediocre/bad qb's, so if Ditka were a great coach, he should have been able to as well.
And let's face it, they won in 85 because of Buddy Ryan and that great defense. Ditka had nothing to do with that, and supposedly didn't even understand the defensive schemes.