Warren was brought to the Duvas by the late Dempsey1234; after the 2nd fight with McGirt he became the first fighter, I am pretty sure, managed by Dempsey.
Chavez`s right hand would be the key, it was always near his chi, he used it to parry punches and as a quick counter, McGirt ate a lot of counters, Chavez would score a lot of counter rights.