MIcca - you also forgot claiming any luggage. And with MCO that can take anywhere from 15 minutes to ??? I really think even heading straight to Ohana might not work. If the plane is on-time, you still have to de-plane, which if you're at the rear of the plane adds about 10 - 15 minutes to your time. Them make it through MCO, down to baggage claim, wait for your luggage, then deal with rental car people, you get the picture. You're probably looking not getting to WDW until about the time your reservation is at Ohana. Personally, I'd move it to 7:30 to give yourself some wiggle room. This way, if things are working right, you'll have time to go to your hotel (ASMo) and get checked in and settled. If not, you can head straight to Ohana and check-in at ASMo later. There's less chance you'd miss a 7:30PS than a 6:30 one.