yeah, that's not a valid argument. If you wait on the QB until you have the OL, you're never going to have the QB.
We didn't wait for the OL to draft Eli. We drafted Eli, then later we drafted Snee, and signed McKenzie and O'Hara. All moves downstream of the QB.
The QB is more responsible for sacks given up than the OL anyway. The OL gives up pressures, but the QB takes the sacks.