I'll try to explain... at the same cap number of about 14M I'd rather keep Mario on for ONE more year than have Glenn for ONE more year. (granted they'd have more time to work on a deal with Glenn with the tag)
Cap Hit would be almost the same for next year...
I'd rather (best case scenario) get Glenn signed long term and we'd have to let Mario go in that case to free up room for Gilmore/Richie. I wouldn't want Mario to go, but it'd be the best case to have those 2 or 3 guys than just Mario.
I just see Mario having a good bounce back year, and I understand potential, but I don't see Glenn as a top 5 LT. I'd hate to lose a top 10 LT though, so it would make more sense to try to keep Glenn long term and take a gamble if they don't work something out to Franchise and try again the next season.
My point was if it works like Byrd did and Glenn bolts, I'd rather have Mario at 14M next season than Glenn at 14M next season...