I'm sure that Gordon would like to review these cameras, but unfortunately he usually only reviews the cameras that he's supplied with. For example, if Nikon offers him their new DSLR to review let's say, as far as my understanding goes Gordon reviews it and sends it back.
He cannot pick what to review, as much as he'd want to. Perhaps you will find some of the reviews that you are looking for in the User Reviews
One example of why Gordon can't review all the cameras is here
, when Gordon explains why there are no more Pentax reviews. Gordon explains that Pentax had stopped sending him cameras and lenses to review, explaining why the Pentax reviews have stopped.
I hope that I've helped, and I apologize that Gordon may not be able to review certain cameras that you would like to see reviewed.