I find the best attitude to have going in is that you may miss rope drop, but it won't be by a lot, and the character breakfast is an attraction in itself.
If you are very urgent on must be out before the rope droppers get to point X, you may stress or miss characters.
It depends on why you're booking the breakfast. I think booking it to eat and meet the characters is the safest approach with the least worry. If you want "beat rope drop," best option is to be a rope dropper, or BOG at MK.