I think Rand Paul has been the most outspoken on issues that matter, and has shown he has the backbone to take on the challenge. I think Abbot is one to keep an eye on as well. Like DeSantis, these people have shown they are not afraid of the press, and are more about action than words.
But does he want the job?
Because more and more that is the most important criteria, to be willing to put up with the arrows that come with the job. And most in DC just want to have a cushy gig with all the perks, and none of the responsibility. They don’t want to be “in the arena”.