Please show me how many mid round offensive tackles have been drafted and how many have made multiple pro bowls. Bushrod was a 4th round pick from a small school, he had talent but was hard to evaluate because of the competition he played against. Marcel Jones has ideal size for an OT, played at Nebraska and was picked in the 7th round.
I'm not saying Marcel Jones can't be a good LOT but I am saying the odds are stacked against him.
Rolling with a 7th round pick offensive tackle that has never taken a NFL snap to protect Brees' blind side would be like flying the president around on a single engine prop plane, you just don't do it.