There's no way that the jet thrust being forced downward is the main reason for the airplanes initial lift off. It plays a part, but it isn't the main reason. Its the lift from the wing.
Ok, I see your point and the example of the wing flexing during take off is quite good.
I came across this yesterday when reading "Ace The Techincal Pilot Interview". The query was
"During what phase of flight is lift the greatest?" and the answer was "
In general, the takeoff".