It is. In general, a single 15 moves about as much air as a pair of 10's. So four 10's move twice as much air as a single 15. Pop a 410 cab on top of a 115, and no one even hears the 15 at stage volume. If you put the 115 on top of the 410 at least you and your band will hear it, and maybe some dancers, but out in the room the audience is going to hear the 410....I agree with @jlepre, the 210 would probably be a much more even match with a 115 cab......
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