It was a silly system that was rightfully changed but you literally said this:
Every team in the top 4 this year had a double chance. If Adelaide lost in week one in 1993 they would've been out.
There is no but. It was an addition, not a but.
Thankfully you get the absurd thing about Crows that year. They lose week one they were out. Win and the jump to second ranking with double chance to make grand final over the second ranked team losing to first.
Nutty professor was AFL chief advisor during the mid 1990's.