Huh?
Ridiculous
The Washington State delegates who go to the convention will be people loyal to Cruz (or who used to be at least), however they are required to vote for whoever wins the primary on Tuesday for the first ballot (which almost certainly will be Trump).
The delegate selection was an earlier event than the primary election. A small little known event attended by people who are super active in the Republican party. Cruz had the place packed with his people so the process ended up with delegates loyal to him.
Now normal people would expect that delegate selection would happen after a primary and then the delegates selected would be those loyal to the candidates who won. And feel its dishonest and rigged to do otherwise. But people that attend these small little known party events so they can wield more power than less attentive and active participants seem to feel otherwise.
Fortunately the new Republican party rules for 2016 require that the delegates to be bound to vote for candidates who win a "candidate preference poll" on the first ballot, which is all Trump needs.
Irrelevant
Trump wins on 3rd ballot
This is just nontrumpers saving face