Dallas was supposed to have crazy depth and three scoring lines.
The line of Marchment/Duchene/Pavelski got caved in all series, and I think it's fair to say that Oiler's 4th line outplayed Stars' 4th line.
When the Oilers made roster changes, they had a wealth of options. Foegele, McLeod, Perry, Ryan, Brown, Carrick have all been in and out of the lineup, and Desharnais/Broberg have been swappable.
When the Stars needed to fill in for injuries, they had Ty Dellandrea who got nailed to the bench after a costly mistake on the PK, Mavrik Bourque playing in his 2nd NHL game. Filling in for Hakanpaa is Petrovic, an AHLer, and they almost had a guy ready to play his first NHL game if Tanev went down.
Whatever depth Dallas was supposed to have, I don't see it.