Easy conspiracy stuff. Reality is Kekelainen opted for a big, physical centreman who was a significant draft riser. A central tenant of rebuilding organizations is to build your team down the middle. During the draft broadcast they allude to Dubois stock climbing noting his switch to centre from wing and physically putting on 40 pounds during his junior career to that point.
Teams also build their draft list over the course of a season which informs their selections not scrambling if/when the player they might want is taken. It's move on to the next on your list.
It has been well documented the belief that Edmonton had a deal in place with Montreal if Dubois was available, as anticipated, at their pick. Oil were targeting defenseman Sergachev who was playing in Windsor under ex-Oiler staffer Rocky Thompson. So perhaps the Oilers had targeted the right player, Sergachev, but changed direction when Puljujarvi dropped and Dubois was off the board so the Montreal deal was DOA. Do agree about Tkachuk. I saw him at the Memorial Cup playing on one leg due to injury and drooled about the thought of him playing alongside McDavid. But also watched the draft to see the Canuckles opt for an over-hyped Knights defenseman leaving the Turtle to fall to Calgary. I knew this would be a problem.
The whole hockey world missed on Puljujarvi. Taking the narrative of nationality out of the equation, C-Bus opted for size, skill and big upside to build around a prospective franchise centre. If Puljujarvi doesn't fall, the Oilers likely have a big, skilled #2 d-man.
This isn't a defense of Oilers amateur scouting. I attribute this ineptitude as the overwhelming biggest reason for this team's decade of darkness.