Just noticed this thread and apologize for the extreme delay in replying. My source for the photo not being of Kyoda and Funakoshi is from Kanzaki Shigekazu sensei. When I showed the photo to him, he was quite adamant that it was not Kyoda.
Personally, if we take a look at the age of both men in that photo, Funakoshi appears quite a bit younger that "Kyoda". Funakoshi was born in 1868 versus Kyoda who was born in 1887 - an almost 20 year age difference. One other point is that Funakoshi is wearing his Prussian inspired school uniform while the "Kyoda" figure is wearing suit.
Kindest regards,