You really think the Blues haven't offered over 7.7 to Pietrangelo's agents?
Personally, I find that highly unlikely. I think that 7.7 number is BS spin from the agents at Newport and the Blues would go 8+ on an 8 year deal, but Pietrangelo and his team want significant signing bonuses. At the end of the day, we are all guessing here, but that 7.7 number should be taken with an enormous grain of salt.
As to the idea of acquiring OEL if Pietrangelo walks, I would definitely be in favor! He would look a lot better on the Blues than he would in Arizona IMO. He is still a very good dman, even if he has had a rough year or two on that team. Plus the cost to acquire him is probably at an all time low. I believe his contract does have a bonus structure the Blues might not find acceptable tho.
If the Blues did move Dunn and Pietrangelo walks, I would definitely be interested in Ghost. Similar to OEL, the cost to acquire him is probably at an all time low, and he is still a very talented player when healthy...absolute killer on the PP as well!