Who's to say he didn't go out there to see if it would bother him, then he realized it would and parked it. They obviously knew they were going to be leaving early by pitting all the way by the gate.
I give Greg all the credit in the world for trying it. I'm just puzzled by Plan B once he decided he couldn't. I had assumed that for owner points, it would be worth having another driver on the premises and ready to go if Greg couldn't, especially when there are guys like Leppo, Stevie Smith, and probably others I haven't even thought of with no ride at the moment.
But as you say, maybe the team thought that Greg was 99% likely to be able to go, and they just didn't think a backup was going to be needed. It just seemed odd for a team that could probably be in contention for the season points lead to not be in a position to run the car, even if Greg was not in the seat. I'm sure there's an explanation. As always, no owner or driver owes anybody any explanation for what they do or how they choose to run their team, but as a fan, I'm just trying to understand what I see going on.