The team lines up in a 4-3-1-2 like this:
This puts a big/small pairing up front like Sigi likes, but it's a fast big/small, and one that can run on to clearances from defense. Having EJ back puts teeth back into the threat of crosses, even if it's been established that it's an overused tactic. The beauty of this, though, is dropping Montero back into a central attacking mid role. He's got a long distance shot which makes him a constant threat from outside the box. If the team is flooding one particular side, he can drift that way and support the play. If they're switching fields, he can be an outlet for a quick pass to the other side. If EJ or Estrada run wide onto a long ball, he can make a run into the box to the post that isn't taken. He can make late runs into the box if all the early shots are covered.
This plan gives the Sounders much greater attacking flexibility, and takes much better advantage of Fredy's skills. If we're going to see the minor miracle we need, that's something that needs to happen.