I'm assuming DBC jumped at 8:13. If the jet was 23 DME at 8:18 then DBC jumped 5 minutes earlier. Back tracking 5 minutes along the Western Flight Path from 23 DME is about 16 miles north and puts the jet very near Tena Bar.
Actually, EU, I thought the same thing but in regards to the FBI path. Backtracking 5 minutes along the FBI flight path, would put an 8:13 jump spot very near the Columbia.
Unless Cpr is an expert and drops then opens at about 1000ft feet, he is going to drift no matter the flight path. He will not land in the Columbia or at Tina Bar in any event even with a jump at 8:13. There is no scenario that drops money at the Ingram find location on Tina Bar. This isnt a murder where a body drops in place to be found 8 years later in the same place! 
But if he no-pulls, then drift doesn’t become an issue. If he jumped near the Columbia then the plane is flying into the direction of the wind. That would negate the forward throw, correct?
The last comment above is the original Chaucer post and comment on drift if Cooper was a no-pull.
Replying directly to Chaucer's comments, statements, or whatever:
1. Drift is always an issue if the wind is blowing. It may be a big issue, a medium issue, or a little issue, but it is an issue.
2. Cooper jumped very near or over the Columbia River and the 35 knot wind at 10,000 feet was from 45 degrees off to the right of the airliner's track. Note that the track of the airliner was very close to 180 degrees true and the wind was from 225 degrees true.
3. Since the wind is from 45 degrees off the track, in this case the headwind and crosswind components have the same values. The headwind component would move Cooper back toward the jump point and the crosswind component would move him downwind from the track. He will not return to the original geographical jump point under any conditions but he will be in the neighborhood. Keep reading below.
The instant that Cooper separates from the airliner, he is subject only to gravity and his body aerodynamics. Once Cooper's horizontal motion with respect to the air mass has ceased, his horizontal motion and the air mass horizontal motion are the same. So when the "forward throw" comes to a stop, Cooper will already be slightly downwind of the track and maybe 1500 or 2000 feet below the 10,000 foot jump altitude. From that point, it is strictly straight down with respect to the air mass. And the air mass is moving horizontally at the wind speed.
There are two different frames of reference at play here. The aerodynamics are determined only with respect to the air mass. The geographical locations must take into account the fact that the air mass is moving with respect to the geography. Be sure to keep them straight.
