The only demonstrable benefit of any shooter qualification scheme is the reduction of bet [changed by edit from "debt"] handle, money exposed to the house advantage (HA), per unit of time. Whether or not The Captain, who reportedly developed the 5-count, was a real person is irrelevant; what is relevant is that he (perhaps supposedly) observed that some shooters, whom he labeled "rhythmic rollers" and we now call DIs, were "better" than others. The source of this superiority (by skill, divine favor, Hawaiian apparel, kirlian aura, or something else) is also irrelevant, but if there is such a source then a player can gain an advantage by betting only on rhythmic rollers. Presumably through experimentation -- perhaps Mr. Scoblette can provide some illumination -- The Captain developed the 5-count as a way to identify rhythmic rollers. Of course casino craps is designed to be a game of pure luck so random rollers can qualify for being bet on regardless of the criteria used for qualification. Still, the assumption is that an imperfect filter is better than no filter at all, and Don Catlan showed that if there is a rhythmic roller at a table a 5-count user would bet more on him/her than on random rollers and could defeat the HA thereby. Why 5 and not 3, 4, 6, 7, 10, etc.? Clearly an any-number-counter could just as well be missing out on some wins as some losses while waiting for a shooter to qualify. Again through experimentation The Captain determined 5 to be the optimum number, striking a balance between losing to quick outs by a random roller and missing a hand by a rhythmic roller. YMMV. No rhythmic roller, no advantage.