Believe you can apply for both yeah, which is why they release the FE results first. They remove your silver/red application if successful in the FE and then purchase your ticket
https://www.arsenal.com/membership/faq/gold
Seems they’ve allocated two lots of tickets to some people. People receiving successful emails and being charged having previously been told no joy.
23% success rate in the silver ballot apparently. Higher than I’d have thought, but i imagine applications low due to holidays etc. I’m at a wedding myself so didn’t apply.