This one’s kind of obvious-sounding, but think about it. What would he have had to go through to write the descriptions for Wu like the Sapphire Dragon? What might he have missed? Maybe certain Wu have different effects, or certain things (like Mala Mala Jong) only came to light after he’d written the scroll entry.
Maybe the Shen Gong Wu scroll isn’t as reliable as it seems.

This one’s kind of obvious-sounding, but think about it. What would he have had to go through to write the descriptions for Wu like the Sapphire Dragon? What might he have missed? Maybe certain Wu have different effects, or certain things (like Mala Mala Jong) only came to light after he’d written the scroll entry.

Maybe the Shen Gong Wu scroll isn’t as reliable as it seems.

Jack’s favourite Shen Gong Wu may be the Monkey Staff, but he is most skillful with the Reversing Mirror.

Jack’s favourite Shen Gong Wu may be the Monkey Staff, but he is most skillful with the Reversing Mirror.