Title question.
The Oklahoma buyer and the Washington seller, both signed the Washington state issued title,
As said ask your state's DMV
I've passed on sales like this. The last buyer.........evidently the guy who sold it to you, screwed himself and you, if this were me, here in Idaho.
If I would have bought a car with a WA title, to take to Idaho, and there was a second buyer / seller in the mix, I could transfer the WA title direct to Idaho.........IF I treated it as if the original title holder were selling it to me, and ignoring the "middle man" entirely. By putting his name in the mix, the last seller screwed both of you.
Here, in ID, I'd either pass, or tell the seller to contact me WHEN HE HAD A CLEAR TITLE IN HIS NAME, no exceptions, NONE. Otherwise, "walk."