After watching it several times, and closely watching his eyes to see what he was thinking, I think you are wrong. I think that he was intending to make the one off the rail and the two ball, and then see what he got on the two.
What sealed if for me was the look he had right after the shot. He looked up into the audience and not at the 7. That told me something in the audience distracted him and he didn't get the results he wanted. He looked up there BEFORE the 7 got down to the the area of the 2 ball.
However, the plan you thought he was going for (and maybe he was) is also a good plan IMO.