You have no idea how much I needed to read this today. I was doing so well with my training for months and then had an IT band injury flare back up, which set me back for a couple weeks in training. All I want to do is finish Dopey without another injury and I am probably going to have to walk a lot more than I originally intended, but this gives me hope that I can shuffle along during the half and the full and still potentially finish.
IIRC, you are a much faster runner than I am, so if my porky, undertrained self can finish a Dopey, you should be able to as well, barring injury flare up.
My $0.02 worth based on my experience:
5K - easy jogging and a lot of walking because: (1) Epcot at night, illuminated just for us runners, and (2) untimed. Take it all in and enjoy.
10K - more easy jogging, saving myself for the half and full. I never saw the balloon ladies
Half - some easy running from Epcot to the TTC, building a buffer between me and the balloon ladies, and using the water stops for the walking part of run/walk intervals. Once in the MK, stop for whatever photos I want to get, then head back to Epcot, again taking it easy with more like 50/50 walking and running.
Full - Again, some easy running in the early miles to build a buffer, then run/walk intervals. I probably walked 60-65% of the full. After the MK, I might walk a mile or two, jog/run for a bit, and then back to brisk walking. FWIW, I started back in corral
K E (?) and the only time I saw balloon ladies was when they were about to enter AK as I was leaving AK right there where the road doubles back on itself. So they were there, closer than comfortable, but no real threat (about 50 - 55 minutes behind me). That said, it meant that I didn't stop for a ride on Tower of Terror, but I finished. The steady, brisk walk will get you there under the 16 min/mile criteria, especially if you can build up a little buffer at the beginning and limit the photo stops. (I did get in the fairly quick line for the pic in front of the castle, and a short one with Dopey himself. Other than that, most of my photos were quick ones, not in long character lines.)
Another observation, the character stops do give you a breather if it isn't too long of a wait.
Here's to praying your injury does not flare back up. If it doesn't, or doesn't too badly, you've got this IMHO.