WI : Catholic and Orthdoox Pilgrim-settlers in Anatolia

Essentially, I'm curious about during the Komnenid period, specifically the rule of Alexios I, about the potential impacts of the Roman Empire inviting Catholics and Orthodox peoples from across the Christian World to settle in the Roman Empire, specifically on the West and South West coasts of Anatolia?

Would there be a significant increase in population (i.e. enough to recruit from), could this help secure coastal Anatolia? What other potential impacts would this have?
 
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