Thank you for the welcome! And I am very happy with my hoard. My only regret is that I didn't go for more stuff at the auction. My unfamiliarity with fukuro, or socket, yari made me skip the chance to buy two of them! They went for something like $11 a piece. The items I posted here are actually only a little over half of what I got, though the other half is largely more unmarked blades and those sweet, sweet shin-guntos that fund my hobbies.
I thought I was just a bad translator when I kept getting Sukesada as an answer for these and my other blade. But it does look like several are from the same lineage for sure.
And yes! I love number 8! The kissaki is almost imperceptible because the angle is so shallow due to the length. Quite elegant! And you missed the part where it also needs three tsubas apparently!
As for the dimensions on number 7, the blades is about 22 inches long but feels longer. The blade is surprisingly hefty for it's size.
I never considered that number 6 might be more than just a franken-katana. It makes sense though, the handle is surprisingly snug and feels quite useable.
Don't worry, already blocked that guy. I haven't touched them with anything but oil and Renaissance Wax.