Plus, Bronze Tiger is a frequent presence in John Ostrander’s comic book run, which James Gunn recently referenced in his Instagram stories (via We Got This Covered).
It’s worth mentioning that Idris Elba has some professional fighting experience, which could point to Bronze Tiger.
Of course, a stunt double can be used for other stuff, but Elba’s fighting experience should be enough to get face shots of him dealing justice.
Of all the options, this one feels incredibly likely.