Billy Strings mixes modern progressive bluegrass flatpicking with the mechanics of crosspicking, with some improvisational jam influences, he adds percussive right-hand attacks, but he plays it clean, and has a mastery of playing lead and rhythm at the same time... On a acoustic guitar.
He may not be "the best" or whatever, but I'd be very interested to know who else has his particular skill set, because there cant be that many.
Derek Trucks is an alien from outer space, and that SG looks awfully familiar.