Flood infects one jedi.
Just one.
All it takes is for a carrier to sneak in during the night, or swarm with mass numbers. Just ONE infection would mean the graveminds have access to everything about the force.
Not to mention that no jedi would survive the firing of a halo ring
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Two month old post but okay. They can know how to use it but I don't think as effective as the actual Jedi or Sith do
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Not only that, but they would understand it's secrets. Think of it as stealing enemy tech, and learning all about it. Yet again, they wouldn't survive the halo rings