It's been a while since I read that arc, so I just grabbed the scans I remember as relevant. Maybe I can clear up some confusion. The blade that cancelled out Majestic's powers was not a Creation Engine blade. Majestic was stabbed with an unspecified Kheran sword during the fight with the Red Blade.
It was stated to be mystically augmented several times, first during the rape scene with Nemesis. ermm
It was actually hinted that the Red Blade had picked up pretty strange weaponry and stuff during their travels to other dimensions. These guys also manage to KO Warblade and cancel his healing factor. I've never seen the Creation Engine(or the Kusar for that matter) blades ever cancel out someone's powers like that.
Regardless, blades aren't standard equipment for Majestic, even if he did use them a little more during the end of WS. They(Creation Engine) are primarily Nemesis's weapons, although they change hands from time to time.