It'd be hilarious in hindsight if they're end up connected somehow, but as for now, the only connection they have is their VA, Okiayu Ryōtarō

Frawnkenstein said in comment #2616530:

It'd be hilarious in hindsight if they're end up connected somehow, but as for now, the only connection they have is their VA, Okiayu Ryōtarō

Oh I had no idea they had the same seiyuu! It would be so funny if dude just transforms into Lordknightmon in the next episodes

BesaPitos said in comment #2616539:

Oh I had no idea they had the same seiyuu! It would be so funny if dude just transforms into Lordknightmon in the next episodes

I didn't catch it either until he started to talk more in the recent episodes. This fanart also points out the stealth "knight" pun in his name, Kishiwada, which is written with 岸 (shore) instead of 騎士 (knight). Since this guy showed some kind of water elemental powers, chances are it won't be LordKnightmon... but the chance for a LordKnightmon recolor is non-zero.