Katie,
I've seen bucks walk downwind past bedded does before. I watched a doe flatten her head to the ground as a nice eight point walked within 25-30 yards downwind of her. She didn't want any part of him. I figured she wasn't ready yet, so that's why he didn't wind her.
I doubt those big boys were "together" either. As Dave said, they were probably on the trail of a hot doe. Once they locate her, all bets are off.
BTW: you did the right thing on the young eight. I have let several big-bodied, young bucks walk this season...no regrets. Since we've been doing this for a while now, we're starting to see more mature bucks in our area...kinda like the one my son shot on Saturday. That was very rare not so long ago.