He hypothesizes the sword was given to the king around this time. The king of Baekje ordered the creation of a replica of the sword with the second inscription and sent it to Wa for an alliance as peers under Eastern Jin.
According to his hypothesis, the sword was presented to the king at that time. The king of Baekje had a replica made of the sword with the additional inscription and sent it to Wa for an alliance, treating them as equals under Eastern Jin's rule.