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Kim Dokja’s Thighs asked a question

Anyone well versed in the guide verse and how all of it works, I have a question. We all know about rankings (s, a, b, c, f) and compatibility rates for espers and guides. And the higher the rate, the better the guiding. So, what if someone is like a F class guide but has 90-100% compatibility with an A/S class esper? Is their guiding automatically better fit compared to a A or S class guide? Is their guiding better for that specific esper than other guides?