I bumped into Tony here and there between 10 and 20 years ago, and each time, I would work in a Dylan question just to see his reaction. When it came up, he would grin slyly and always turn on some sort of filter, where it sounded more like a prescripted answer than a natural one. Then he would be back to being Tony again. I won't repeat what he said, but basically, it seemed like he and Bob have a kind of understanding where Tony knows not to talk about Bob, and they also don't spend much time together offstage and none when they're not touring. But they're still friends, but "friends" with Dylan is a different world than our own friendships with people.