I'm open to Claflin being a character in the DCCU, but from what I've seen, I don't really like the idea of him as Hal. If Snyder sees something in him and he knocks the audition outta the park, then I'll support it, but as it stands and until i see an audition tape, i'm going with no on Claflin.
Aaron Paul has completely proven himself as a likable hero in my eyes, his versatility and natural swagger suggests that Hal Jordan would be an easy role for him to nail. The pictures of him posted in this thread resemble the character imo. Then again, Momoa and Miller vaguely resemble their comic book counterparts, so they may go with a very different look for Hal.
Ezra Miller/The Flash is so young, his casting suggests that we'll be getting a younger actor as Hal too. The pool of talented young actors is somewhat limited today, i think the best male actors today are in their early 30s. It's crazy that the solo movie will be in 2020, six years from now...it seems likely that they will go with someone under 30 for Hal.
I wonder when we could expect a casting announcement...we need to know if he'll appear in Justice League 1 or 2