I may be in the minority here, but I think Brown re-signing would make it a better chance of Moses leaving Parra. If Brown went to Dolphins, all of a sudden, they increase their offer to make sure they don't lose both and that door is shut.
I'm not saying he won't re-sign. But with Brown sticking around, surely their offer to Moses is limited in how much they can give him. The 6 year player option screams desperation of a club giving a player everything they needed to keep him from leaving (maybe for fear of losing both?)
Everything is speculation no matter which way you look at it now. Hopefully soon there will be an official announcement one way or another that sorts it out and clubs can move on.