Ah, thanks for the clarification Geraint! I now understand what you were eluding to.
Yeah, it seems that the more I look into the signature, the more I keep finding discrepancies that does not match legitimate Yasutsugu signatures. But then again, that is also just my naked eye and I have no knowledge or expertise.
But yes, I am considering getting a shinsa on the sword but I'm going to wait it out and see if I can get more information before I do so. Also, I'm reluctant to part ways with the sword for that long since I just received it lol.
I'm still hoping I can get more info from others but thanks again for feedback.