The distinguished gentlemen

In the image below we see John and companions taking tea on the manse veranda. I presume anyway from examining the image. The image is in the form of a postcard, a popular means of exchanging photos at the time. Is one of these distinguished gentlemen GH Denning?

GH Denning was a correspondent to John and Augustine and sent a couple of postcards like the one below which is annotated as follows:

“To Rev J Heinrich in remembrance of a happy time spent at the Blenheim manse. GH Denning”