Not that anon, but I think the number of eps/duels isn't the problem, it's what they do during those eps. Bowman's first two duels are rendered pointless because there's zero progress made on who he is as a character. >1st duel: unknown guy with no memories>2nd: "I'm you!" "That's false and here's why" "Welp back to square one."
Only at the third duel does he stop being a blank slate and have an identity, but by then it's too late for me to care for him as a character.
Also his personality feels too mild-mannered(?) for a villain. But that's a whole other issue entirely.