Err, no, you've got it the wrong way around.
The 10 isn't a ranking, it's his power level. In other words, Nasu is saying that Shirou is 10 times weaker than Ciel/Rin, or (under certain circumstances) about half as strong as Rin.
What he's saying is that Shirou << Rin, except if it a situation which involves tracing, and then he's not too far behind her....
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