Is it possible to have a 730 breakfast at Ohana and make it to rope drop at magic Kingdom?
I doubt it. Technically, getting the full benefit of rope drop would mean you arrive 30-45 minutes before the park opens so you can be at the front of the crowd. If you just want to see the welcome show from a distance, and the park opens at 9, then you might be able to make it there by 8:45. You’d be very rushed though! It can take 90 minutes to see all the characters at a character breakfast. Sure, you can eat faster than that, but you’re paying for a character breakfast, so it would be a shame to duck out early.