I found your time based on your bib and description of your times. I used the splits provided by RunDisney from during the race to calculate your pace between mile markers. I assumed (which is a jump) that between mile markers with splits that your pace was even. Thus, you hit mile 5 at 1:07:37 and mile 10 at 2:16:24, thus the time between was 1:08:47 with a pace of 13:45 min/mile.
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In theory, if you ran an even 18:11 min/mile (8 hour marathon) you would have been passed by the balloon ladies at mile 15.1 and thus swept. This can be seen in the above graphic with the box in black around 15.1 where the "even pace" and "balloon ladies" intersect at 10:36am.
But instead, because your are an experienced runner at faster paces you were actually at mile 15.1 at 9:40am roughly 54 minutes ahead of the balloon ladies. This is because up to this point in the race you were running a 14:27 min/mile.
You actually didn't get passed by the balloon ladies (in theory) with your pacing strategy until mile 24 when your time at mile 24 was 12:59pm as was the balloon ladies. You finished ~24 minutes slower than the balloon ladies after being even with them at mile 24. So you must have JUST made it past the last sweep point and then was able to be allowed to finish. Very lucky indeed!
The strategy worked for you because you weren't running an even 8 hour marathon. It worked because you were experienced and could run a 14:27 min/mile through 15.1 miles and this wasn't pushing you to your current physical limits. Although for someone who is projected at a 16:00 min/mile pace running the first 15.1 in 14:27 isn't feasible and would likely end up in a major slow down in the end ensuring a near inevitability of being swept. So your 8 hour marathon was lucky and only accomplishable because you were capable of actually going faster than an 8 hour marathon in the beginning of the race without causing you to succumb to a massive slow-down to the level of being swept. So yes, an 8 hour marathon at Disney is possible, but very unlikely for someone who has an actual physical limitation of running a faster marathon than the cutoff of 7 hours.
An interesting case-study.