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Ford's positive connector locks SUCK. One thing that has given me good luck is to spray the hell out of them with brake cleaner, and flush all the dust, dirt, and debris out of that section of the connector, then carefully use a pick or cat claw to free them.
As far as using the broken coil, the answer is MAYBE. If the conductors inside have been compromised then you will have a misfire for sure. Only way to know is to pop it back in and see.