It didn't really matter who they played. Every team has had to go through this process. Hawk won a cup and then had to spend the next two seasons (maybe more) rebuilding their depth and letting their kids "learn to win".
The difference is they retained their core players. You still had Kane, Toews, Hossa, Sharp, Keith, Hjammerson, Seabrook, Stahlberg, Bickel playing. They let players like Buf, Neimi and others leave because they had faith in their AHL system. Crawford has come a long way and getting Leddy solidified their Top 4 pairings. They needed to fill voids in center and the fourth line. And now the entire depth of the team can score any given time.
Face it, outside of Hossa and Sharp we were beaten by their 3rd line players. Hossa had 5 goals and Sharp had 4. Sharp's came in Game's 2 & 4 and Hossa was what they missed so dearly last playoffs when Torres basically killed him, consistent scoring threat. Kruger, Shaw, Stahlberg, and Bickel were the ones scoring the bigger goals. I think Clutterbuck and Mitchell were the only 2 that scored goals this series not on the top 2 lines.