The battle among the Mongol mercenaries, the Cheun Jen Sect Taoists, and Yeung Gor and Little Dragon Girl at Chung Yeung Temple was the last appearance of Ma Gwong Jor in ROCH. Thereafter, Ma never appeared again, nor was he mentioned.
Ma Gwong Jor was a minor, but interesting character from ROCH. He was one of Yeung Gor's few friends who wasn't an elder/Great or an attractive young girl. Yeung Gor seemed to genuinely like this crudely skilled, but friendly and brave goofball, and even made sure that he didn't get killed by Gwok Jing when the Mongol mercenaries fought Gwok.
What do you suppose happened to Ma Gwong Jor after he stopped appearing in ROCH? Do you imagine he was still alive after the sixteen years of Little Dragon Girl's disappearance? Would Yeung Gor (as the Divine Condor Hero) have recruited Ma Gwong Jor as an ally to help him fight the Mongols? Yeung Gor did recruit some old friends and acquaintances (such as Passionless Valley's Fan 1 Yung) to help him fight the Mongols, so I wonder if he might have recruited Ma Gwong Jor if they ever met again.