I still need to see DC win a road game or two before I anoint them a top finisher. They had 5 chances after Rooney showed up and won zero. There's also no guarantee they have as much home success. I expect them to be good. And they could finish in the top 3 and even win the conference, but I'm not sold yet. Still, I do agree that at 16-1 they are one of the better plays on that board.
Plus, regarding your 1-2, I expect either Atlanta or the Red Bulls to have an inexplicable slump this year because MLS.
ETA: Setting these odds or worse, placing a bet on MLS Cup right now, before we know if Almiron or Adams are definitely leaving, and how LAG solves their 4 DP situation, and who teams like NYC sign, is nuts. And that's the main reason I end up liking the DC bet. They are basically a complete team right now, and at least capable of winning 3-4 straight games in the playoffs.