Because Tradetalk was there first, of course. Besides, Tradetalk almost certainly *is* a pidgin (pidgin Waertagi and East Islander, with bits of Ludoch, IMG). In fact, the word "pidgin" supposedly was Chinese/English pidgin for "business", which is as close to Tradetalk as you can get without copyright problems :-)
Since the pidgin grammars never seem to vary much, it will seem reasonable that it was invented by a god, not by the peoples in contact. In RW terms, it seems that pidgin grammars are generated by setting all the stops in Noam Chomshy's grammar box to their default positions.
As to someone's earlier question whether there were Creoles in Glorantha, my guess about Western speech (Seshnegi, Jrustelan, Old Akemite, etc) is that they were originally pidgins from Old Brithini and the local hsunchen languages. I doubt that anybody recognizes their language as a Creole, though. They just think that Issaries must have been from there, originally, since Tradetalk is so close to their speech, handed down from Grandfather Mortal, himself, of course.
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