Regarding number 3, I don’t see many fighters at 145 putting Sherk on his back. The two notable guys who did were GSP and Hughes, the two best WW’s of all time.Actually yes.
Like you said though - first of all, has more diverse striking.
Secondly - he has normal reach. Sherk was Trex.
And third - Volkanovski is much better on his back. Sherk struggled when taken down. Volkanovski is not some TDD master, but he knows how to get back to his feet.