It's pretty easy to look at every scenario after a game and punch in the numbers and give the probability. These coaches are facing a play clock, are not sitting in front of a computer, etc. If you think McDaniel had any clue there was a 3.5% sway either way when he made his decision I think you are delusional. I may be naive.
He absolutely knew the percentage for the general case. Each team uses their own models, but if you don't think they have a chart or someone in the booth available with the numbers, I do think you are naive. 4th down, X yards to go, up Y points is a set of numbers that are very easy to run beforehand.
The 3.5% is obviously for the average case across the league and I would seriously hope that the Dolphins use a model that is optimized for their offense. Hopefully, they adjust the numbers every game for their opponent.
I would also hope that the McDaniel uses what he has seen all game long to tip the scales one way or another when deciding.
There's a lot of hope there and I obviously have zero clue what the Dolphins actually do.
Personally, it *felt* like the wrong call, but the Dolphins have actually been quite good in "power" situations this year, so I'm not able to point to easy numbers that back up my *feelings*.