Hi spiShane, it is pleasure to be able to help you.
Per my knowledge, it is a default behavior if you add a list/library as a co-owner then everyone who has edit access to the list/library automatically gets edit access to the flow.
For giving access to everyone to Share Point flow in your organization, another possible approach is exporting the flow as a package and putting that package in a place where everyone can access it and then import it.
Hope this helps.
Best Regards.
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