I understood #1, #2, and eventually #3 after another look to better perceive the 3-D and features. Leave final judgement till I had it in hand, or at least the room.
Personally, I don't feel #4 is correct,
and #5 I would have gone with Tosa Myochin unless something felt very different in hand.
I think of this as a very popular Tensho 天正 era suggestive image. [I wish Ford were still here to argue with me about it.]
You are going to see lots of interpretations from all over Japan, and the 3-D of the tsuba and working matter a lot.
2-D Black n White images are challenging.
I sometimes wonder about the accuracy of old attributions done by mail correspondence with black n white photos.
Especially with a design like this.