O'Malley has steadily increased the utility of his jab (Patreon)

As a sharpshooter, O'Malley needs a lot of space in the cage to be able to work his feints and darting combinations. As he has improved, he has learned to use his jab better to cover his lateral movement, back opponents up, and halt them in their tracks when they charge in at him.

Despite constantly looking for parries, Chito had no effective defense and no answers for O'Malley's jab.  This allowed O'Malley to use his jab feints to set up more damaging offense.