I believe nicotine + caffeine = protein
The guy's age might have been a factor. He might have had a 1st class PFT if he was over 27 (someone back me up if this isn't the correct age). If he was younger than that I am shocked that they let someone graduate with a sub-1st class PFT score unless he had a broken leg or something along those lines and was just tough as nails and wanted to gut it out (and the staff let him).
We had a candidate in our platoon that got 7 pullups was second to last in the run ahead of a injured candidate and im not sure about situps, but came out to around a 209 final pft. He graduated without going to the boards. At this point with a combination of other things throughout OCS I started losing confidence in the whole screening process. Thankfully there is still TBS.
Keep your faith in the screening process, it does a good job. There will always be those "special" few, and typically their PFT scores will be the least of your worries when you have to work with them.