I will throw my own Jean Pierre inspired comment in for the fracas:
Muromachi swords are NOT Koto.
This is my own take. Koto ended with the Nambokucho period. There are perhaps a smattering of a few good smiths/works in the Muromachi period, but to me, it's not the level of work to qualify as "Koto". And of course this is the era where all the Kanesada, Sukesada, something-sada works come from that end up taking so much bandwidth here on NMB and FB with questions like "is this THE something-sada, the good one?". Usually, no it's not.
Darcy of course explains this better than I ever could here:
https://blog.yuhindo.com/visualization/
Key Chart; all Juyo and higher blades by era. The Muromachi period is the wilderness: