The Philadelphia Phillies had a path to win the National League Division Series before it began. The Los Angeles Dodgers came in as the defending World Series champions, but they had holes in their roster as much as anyone else. They had a leaky bullpen going into the playoffs, but you wouldn't know it with how well the Dodgers managed their bullpen throughout the four games.
The Dodgers' bullpen was the part of the roster the Phillies' offense had to get to in order to succeed. As long as the Phillies could hang in against the Dodgers' starting pitching, they'd have a chance in the later innings.