I'm not sure where enfp's coming from either. Impatience certainly isn't a strictly enfp trait...if anything I would predict estp's would be more impatient since there's real-life things to get up and go do.
But both guys are hard to type since you only see them in one environment (a very sensor-oriented one), you don't see their personal life, just the show which is at least partially them "acting", and you mostly don't see them interact with other people at all. The most I would really be confident saying is that Bear is E and survivorman is I.
As noted, impatience is a core e1 trait.
When there aren't others for a subject to interact with, look at how s/he cools.
Do you think his expressions are more played down or explosive?
I think that eliminates possibility of a 9 wing.
When I listen to him tearing into a dead sheep, pulling the heart out, it's almost like he's welcoming the viewer to join in.
"Come on over, have a bite with me" (implied, not an exact quote). Sounds like a 2 wing, whereas a 7 winger would ask the viewer to dance inside the sheep pelt with him.
That eliminates possibility of either 7 or 9 wing.
Moreover, the sx/so e8 is described as the "alpha" fe/male, would be more inclined to stuff the sheep carcass with dynamite,
whereas Grylls, in my mind, as over the top as he seems, is going through the step-by-step "this is how you don't die" process.
So really, the argument is whether Grylls is an sx/so e12 enfp or entj, but he resembles istjs I've come across and an enfp uncle, which is why I lean enfp.
People can't act nearly as convincingly as most on this forum tend to believe.
I don't think either of them are.