Why would it be inaccurate to describe Fletcher christian as a conscientious first mate?

Fletcher Christian was not the first mate of the Bounty, he was the master's mate.

Also, Christian was not particularly conscientious. He was a skilled navigator and seaman, but he was also known for his quick temper and rebellious nature. He was often at odds with Captain William Bligh, and he eventually led the mutiny on the Bounty in 1789.