Agreed
Frankly, suggestions that this large darker area was some kind of "cave" are just plain silly. In the first place, it would have to be a huge opening. Secondly, does this mean that all darker areas on Mars are suspected caves?!? Calling this a possible cave is merely the result of overactive imaginations and wishful thinking.
Now, don't get me wrong. I do think there are caves on Mars. Certainly, we can expect to find lava tubes there. But finding a big cave opening exposed in the side of a hill from a satellite image is pushing the limits of credulity.