Pilot Kawasaki also appears to be wearing white shirt. Not exactly sure of the color of the shirt the second person from the right in the image at post # 45, but it is definitely not white. That, plus the aforementioned differences in hairstyle and age, plus the fact that Kawasaki is not wearing eyeglasses while the Oriental-looking man in the image at # 45 surely is, verifies that the man in the image, second person from the right, is almost surely Keith Yamamoto.
I don’t think he is Yamamoto. This guy appears to have a ponytail, and if the dark mark on his cheek is glasses, it is a wider bow, not the narrow wire bows that Yamamoto has. The photo by the ambulance, where the rescue workers are patting somebody on the back (which seems like it would be the “distraught” Yamamoto who would need the extra comforting pat on the back) shows him wearing blue swim trunks (as he was later described at the Honolulu airport) and a sweatshirt, which he was probably wearing over the top of the shirt he was seen leaving the Honolulu airport in at about 7pm. Also, I think Yamamoto is heavier-set than this guy.
That guy could be Jacob Key, which would make sense since he’s close to Rosa Key. But like you say, the shirt doesn’t seem white; it seems more brown. The person sitting across the aisle from Fuddy was wearing a brown short-sleeved shirt which would make it seem like it was Yamamoto. But I don’t think it is Yamamoto because it doesn’t fit what Yamamoto was wearing in the other photo or what he is described as wearing at the Honolulu airport.
I think it has to be the 70-year-old guy. Seems well-preserved, if so, but then when I look at the photo of the woman on the stretcher all wrapped up she doesn’t look 74 to me either.