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Looks like you have a great sammich in your future!
Don't bet 100% on the 10 hours. Some butts have a mind of their own and will take longer, or even a shorter amount of time. Keep an eye on the IT starting at around 8 hours to see where you are.
If you can eat it, it's not a failure.
What was the final IT? I'm guessing that it didn't cook long enough. A good indication of done, for a pork butt, is when the bone pulls out very easily when tugged on.
Yeah, it just didn't go long enough. Like I said above, some butts have a mind of their own, I've had some 18 hour cooks with them. That's the main reason I make it the day prior to the planned meal.