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I read in one source that Yongle was trying to establish a commandery/outpost in Sulu and actually the the name Lozon used to be a name for Sulu.
http://tausug-global.blogspot.com/2010_06_01_archive.html
If the Chinese established a commandery in Sulu that might mean Brunei might not attempt to encircle Sulu and try to destroy Tondo.