The Trail Blazers have supposedly deemed Collins and Simons off limits (which obviously means, for what a big expiring + one could realistically fetch). They probably don't go beyond Whiteside, a lottery protected 1st and maybe a minor asset, like Trent Jr. or a future 2nd.
With the same caveat and for sentimental reasons, we all know Mills is off limits too.
That three teamer is solid, but I don't see the Kings including a 1st.
Also, Bogdanovic is 27 (28 on August 18th), so he's not a prospect. Re-routing Dragic would yield the requisite secondary asset.