I heavily disagree. On the subject of food and sleep we see them do both during the episode. They sleep in the car and Daryl had himself an entire snake. Second you are assuming we see them eat every time they need to. That would make for boring television.

Maybe he was taking a nap on the shitter. Maybe he was just catching a breath.

Seems like everyone missed this but immediately after he dies you can hear him breathing in a scene. It wasn't totally obvious it was him breathing but it was obvious enough to understand what was going on I thought.
And it wasn't turning into a walker breathing. I mean honestly are people willing to believe that the…

Or much more likely they are used to hearing scuffles and thought nothing of it.
Like, I don't know, the fight two dudes just had over a bed that no one checked on.