Sounds perfectly plausible, EU. If he had bailed out when he intended (outskirts of Seattle), it would have given him the entire duration of the flight to Reno to escape. Moreover, had it not been for the pressure bump, the search area could have been anywhere from Washington to Nevada.
The fact that he jumped later than intended would have put him in very unfamiliar territory and made any escape many times more difficult. Instead of walking home into the suburbs of Sea-Tac, he had to hump it out in remote, rugged, rural Washington in a business suit and 25 lbs. of money. I think that would have made it virtually impossible for him to escape detection.
If he bails near SEA and it is detected LE can draw hundreds of people to a small search area very quickly and circle him - bailing later further south LE loses all advantage, just as it happened.
Cooper's socalled INTENTIONS are irrelevant and impossible to know - its what he did that matters. Intentions and thoughts (and impure thoughts) can only be guessed by performance/demonstration. Testing programs and psychometry can only measure and predict based on recording people's actual performance. We learned that thru testing conducted in WWI!
That was the flaw in PLF's whole 'thru the lens of logic'. He makes assumptions which are untrue, unprovable, unknown, unknowable! PLF makes assumptions that only agree with himself!
Fact is: nobody was reporting to ground control and LE what Cooper was doing or not doing, or what it appeared he might be doing and his INTENTIONS ... after take off until about the time Tina came in to the cockpit. Cooper actually jumped shortly after this. Moreover, Cooper did not "prepare" for bailing immediately after takeoff, if by some guesswork you know his INTENTIONS. Cooper went through an orderly step-by-step procedure ... 'and it looks as though he's getting ready to jump' ...
Cooper did not perform as a person getting ready to perform a jump right after takeoff at SEA! Factually, he was not ready to jump immediately after takeoff; that had nothing to do with him not being given the backpack for the money or the delay due to fueling, as Flyjack contends. For one thing his plan relied on testing the stairs under stable flight conditions before bailing ... his communications with the cockpit just prior to jumping document that.