I'm a bit rusty on Bionicle lore as I haven't followed it for a year or two, but in addition to being destined to take over the mata nui robot, wouldn't Teridax also be destined to lose? Thus, it wouldn't make sense for him to be proficient at wielding the robot initially.I'm not sure I completely understand what you're asking, but that is my take on the robot inexperience bit.