1978 was the NBA Finals that the Bullets looked ready for and ready to play and win. Rather than expecting to win it, because they were there in 1975. So you see a much more professional and better prepared Bullets teams in this finals, than you did in 1975 when they were swept by the San Francisco Warriors. The Bullets almost won game 1 in Seattle, I believe at the Kingdome and won all three home games in Landover at the Capital Centre. So winning this game is something that was perhaps not surprising to the Bullets themselves, because they knew how close they were in game 1 at Seattle.
Sometimes very good if not great teams need to lose and lose big even when it comes to championships. Because they really aren’t as good as people around them think they are and have a tendency to believe their own hype and rely on that to win. Instead of continuing to do what got them to the championship in the first place which was being a great team and playing like one. And beating very good if not great teams just to get to the championship. And that might be what happened to the Bullets in 75. That they needed to learn to be a champion, you have to play like one and not expect it to happen, simply because of who you are.