All devices are polled periodically. The ordering of the wired/wireless scans doesn't matter. Correlation happens when RAPIDS sees that it has 2 events within a set time period (designated in RAPIDS -> Setup). The only thing that matters for RAPIDS is the RAPIDS -> Rules. The rules are processed from the top down, and stops once it finds a rule that applies. The general recommendation is to begin with the most specific rules, and then work your way to the broad catch-all rules. These rules are different for every deployment depending on which rogues are more important.
For example: to several customers, a rogue found on the wired and wireless is the most important. For other customers, a rogue that's heard wirelessly by at least 3 APs with a signal strength of -60 (or stronger) is a more severe rogue. Typically, the rules for specific known rogues should be made first, then rules for specific valid internal devices, and then after that you go into the more general rules.