It's not just FA. It's RFA. R stands for resricted, meaning their current teams can and WILL match any offer. No shot in hell do they not match. If they wanted to trade those guys, which they wont, then they'd be asking for A LOT. So much, that it's probably not worth it.
“Whenever I’m about to do something, I think ‘Would an idiot do that?’ and if they would, I do NOT do that thing.”- Dwight Schrute