Why are you so hell bent on getting proof that this was your idea? At this point Peter already said if you were the one then mad prop’s.
John is not one to lie about stuff and has always shown the copious amount of notes that he takes. I only use one pen style at work and it is a blue pilot G2 0.7 pen. So there are years worth of notes that I have that written in only that pen. Also due to my OCD my note pads all have a pen slid into the spiral portion so it isn’t out of the realm of possibility for me to use the exact same pen for an entire project.