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I
I had this same thought when I heard Staton indicate the task force would include these departments. Why? And then it dawned on me. Multnomah County is basically the City of Portland, Oregon and the surrounding unincorporated areas. The only other "cities" in Multnomah county that have police departments are Gresham, Oregon and Troutdale, Oregon along with the Port or Portland Police. So I am concluding that the Multnomah County Sheriff's Department has pretty solid working relationships with the PDs located within their county. And it makes sense to my anyway that the County would look to the cities within their boundries for support of the investigation.
(Before I am corrected, the northern portion of Lake Oswego is also located in Multnomah county, but the majority of LO proper is in Clackamas county)