Why do we have to take Bane's opinion on Kas'im's technical knowledge seriously again? This is a guy who had known how to wield a training stick for a few months, and a real lightsaber for a few weeks. He had no clue how to counter jar'kai, for example, while a padawan Anakin felt confident using it against Count Dooku. The only benchmarks he had to compare Kas'im with were fodder trainees - other than that, he only had Kas'im's word. He's not exactly an authority on comparing technical ability, lawl.
Until recently, Kas'im was possibly the single most overrated combatant in the history of Star Wars. People were actually claiming that he could challenge Darth Sidious in a duel. Heck, even Gideon thought this, despite being a verifiable, infallible super-Godgenius to whose honor we all devote ourselves.