We now think omega Centauri is the core region of a small galaxy that had been previously ripped apart by the Galaxy. Being small, it never had the initial central core mass to form a large, supermassive black hole. More than likely, the hole formed from the collision of stars and gas/dust clouds in its central regions during its formation. If it's as large as they say, 40000Ms, then probably upto 200,000 - 400,000 stars could've been involved in its formation (discounting gas/dust and taking the majority of the stars as being M class dwarfs).
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