Personally, without looking at the players in question, my thoughts are that if they are/were both on the board that either one, or both could go and if you don't mentally prepare for that you'll be upset if they both leave.
I also don't know if I read it somewhere once but it certainly does seem to me that the make up of your roster and incoming recruits vis a vis your positional depth does impact a player's likelihood of leaving. I could very easily be wrong about that though.