No Worthington or Holloway. Worthington can't do an American accent to save his life and after watching Sabotage, I'm convinced he'll never improve as an actor. He's hit his ceiling, which is acting ability somewhere between a kid in a high school play and a reasonably decent community theater actor.
Holloway is okay but he's really only been memorable in one role. In action films, he's pretty much been relegated to "the guy who gets killed first." I don't think he has leading man charisma, at least not on film (though admittedly I didn't see his possibly Oscar-worthy turn in Battle of the Year).
Other actors they could consider...
Philip Winchester. Looks like the spitting image of Rick Flag and/or any comic book superhero/secret agent type. And as anyone who has seen Strike Back knows, he can play this type of role in his sleep. Is it typecasting? Probably. But so what? He'd be perfect.
Dan Stevens was brilliant in The Guest, so if he landed this role, that'd be amazing.
But they'll probably go with a bigger name. Gosling would rock, but it would never happen. Just not anyone off of Hollywood's Let's Shove These Guys Down Your Throat list (Taylor Kitsch, Armie Hammer, Ryan Reynolds, Taylor Lautner, Channing Tatum).