Evans has power in D.C., but is not at the same level as those you mentioned. The highest profile kingpins will likely go down all at once, just as is done with typical organized crime figures. Evans is a stepping stone on the way to the final bosses.
NBC Bay Area just mentioned the possibility that ICE raids were compromised as to why they were canceled. Also suggesting there was no place to house 2000 people, which I don't believe.
He needs to be locked away for 10 years or so.