As for the weapon thing, I've always held that pre-death Lucca knew a LOT more about the CC situation than was explicitly stated. Possibly this could be due to conversations with Belthasar and/or Magus. Or maybe it's just because she's a mad genius. Either way, I think she was selling weapons to Porre so they could overcome El Nido's elements and warriors. And of course, the Porrean invasion was one of the prime elements (npi) in the setup for CC.