There's some misunderstanding of the whole process in general. First up, you're not necessarily competing against the other guys that are selecting that week. It's possible that it happens, but the bigger issue is how many slots they're willing to give up that quarter/FY. It's part of a MUCH bigger equation that happens WAY above most of our paygrades. The short of it is, are "they" willing to cough up one more slot for "you" this week, or would it be better for "them" to wait until next week. This is where input from the CO (and flight leaders) comes into play. So if one week there's a bunch of jet wanna-bes, but they're aren't a bunch of jet slots, "they" can look ahead to the next week and see that there is only a handful of selectees and that most are going to be helo/other. That way, "they" can take a slot from that week and apply it early.
Also, it's not like there's "so few" jet spots. I've seen J1 and J2 selections for the last few months pretty regularly, and amongst a lot of competitive NSSes. Overall, there's more "Other" pilots than jet types (helos alone make up around 52% of Navy Air, depending on what powerpoint slide you read), but there's plenty of jet slots for those that are deserving.