Raw power wise Black was still inferior to Vegeta by the end of the arc, only having the advantage due to his clones.
Hit can ignore the clones and just instantly kill him, just like he killed Goku.
Originally posted by DamborgsonNot really, Jiren could have just powered up further at any time.Hits worst enemy was plot. He had Jiren dead to rights with the saiyans from universe 6 there to back him up.
Also he's got other time shenanigans. If he used the time lag, Black is equally dead.