Thread:B214/@comment-30924344-20170605100644/@comment-1359322-20170606111926

There has been no mention that Great Red's appearance has changed before nor was it mention that Great Red is genderless.

That's the main point, neither the LN nor Ishibumi in his twitter and blog has mentioned a thing about Great Red being able to shapeshift and is genderless.

Unless if you have a source from Ishibumi that can prove your point on Great Red being a shapeshifter and is genderless, this issue is just a speculation on your part.