Jupiter Master co-op was surprisingly lively, when I tried playing. Jupiter Expert might be as well, but I didn't check. Go ahead and give it a try, especially with your first three Dragon Trails of the day. You'll probably be able to clear it with other people playing.>>230761725
How much wyrmite do you have stocked up? It's not a bad idea, but if you're playing co-op then you really only need a single good light character. So it isn't terribly necessary if you'd prefer to wait.
Silke isn't terribly better than Jupiter and you can get Jupiter orbs (and thus, extra Jupiter copies) by killing him a bunch, meaning you could fully unbind him for the higher equip bonus.