There's a possibility, albeit small, that Kon and Fears are both gone before 6. So in the interest of mathematical certainty, the Jazz would still do the Wizards deal after the first 3 or 4 picks have been made. I'm assuming that the Jazz will have "their guy" that they want, whomever that turns out to be, and they'll make sure they get their guy.
Also, what if the Sixers offer the Jazz #3 for #5 and #21 when the Sixers are on the clock and find that the guy they wanted at #3 is no longer available? The Jazz will wait and see how the draft plays out. The Washington deal isn't good enough to commit to in advance, imo.