Potvin just got good enough so that we could afford to trade Fuhr (who was also very good of course) so sure we had goaltending, but we also had good team defence in front of the goalies.
I think you're thinking of later teams, I don't believe Jonsson was part of it in 93. IIRC we had 5 non-elite, but very good Dmen - Lefebre, Ellett, Macoun, Rouse and Mironov who we kept rotating and Gill was a really good "#6 guy. And when Pat Burns took over and Gilmour arrived, all the forwards played D as well.
I stand by what I said - that team was rock solid defensively. Think of it this way, we basically had only 3 players who were threats to score yet we came within an inch of making the finals. The reason we went as far as we did was because we played team D at a level we haven't seen since then.
Edit - link below to the final standings in 93. Look at how our goals against compares to the other teams and prepare to be impressed.
1992-93 NHL Standings | Hockey-Reference.com