Yeah, could be too. I keep looking at the photo and now that you mention it I'm not sure anymore. After posting my reply and thinking more about it I sent a copy of the image to the Kobayashi family to ask them to to take a look... It sure looks a *lot* like Kobayashi, but... I don't recall him ever being in those books...
Actually, I am pretty sure that is the late Fumio Toyoda, who was my instructor's instructor way back when. His picture was replaced with someone else's in later editions, probably because he left Tohei and started his own organization.