Man this is not coming from the sunroof drains. This comes from the broken body seam/sealant in the rear wheel well. You need to tackle this as soon as possible. I'm still dealing with it but you need to get a hold of it ASAP. Mine got worse to the point that I lost the pinch weld in the pic you reposted. It's not fun and hard to tackle until you lose the whole pinch weld area.