With the David's Mighty Men, I'm referring to any warrior that was labeled as such in scripture that he had chosen.
That includes Abishai, Jashobeam, Elhanan, Maharai, Shammah, Shamhuth, etc...
Some of them being banded into battle give much higher perks, especially since some of them also have banding abilities and can thus band in other heroes that can decimate even full on Assyrian defenses with all the capture and discard abilities.