I think they released RFI knowing it would take off and be the 2nd single to launch the album with... or at least it would be an option. LWYMMD was an excellent way to kick off the era, and it was wildly successful, but it's not a song that US radio would typically play for months on end, so if that happens, great, but I doubt it. I think releasing RFI so quickly allowed them to see what radio would do with it, and I won't be surprised if they're cooking up a video and prepping to release it when the time is right in the near future.
A lot of chatter in forums about how RFI is sabotaging LWYMMD's success, but I don't buy into that because it's already a Hot 100 #1 song with a massive launch and has nowhere to go but down from here. I don't think longevity was ever the ultimate goal for LWYMMD - and it's already done its job. The longer time between LWYMMD and the album release date supports this theory, imo, because it gave LWYMMD some extra weeks to do its thing before moving on to the next prior to the album release.
LWYMMD has proven to be somewhat divisive, so continuing to push it trying for a 10-week #1 isn't doing her or the album any favors. If RFI was just intended to be an interim promo single with a football licensing deal and they have something else geared up for single #2, that's ok too. It still is ultimately helping her in terms of album sales, which is always been the goal for her.