Possible evidence? I’m not sure what you mean by that. Anything can potentially be evidence for some claim or hypothesis. I already believe that is the case, that is how I understand logic and evidence to work. That it is possible that some object, or observation, entity, or data, can be evidence for some claim or hypothesis. It is POSSIBLE evidence, sure.
But IS it evidence? I don’t find “it’s possible that it’s evidence” a compelling reason to believe. I have to be persuaded that it actually IS evidence, and then I need to find the evidence persuasive.
You understand? If you show me a blurry picture of some disc-shaped object in the sky and claim it’s a extraterrestrial space craft carrying alien visitors from another planet, I’m going to agree that indeed your blurry picture is “possible evidence” for your claim. It might even BE evidence if I find out that the picture has not been doctored or altered in any way, and if I trust you. That’s the first two hurdles out of the way. It is “possible” evidence, and it even IS evidence.
But is it persuasive evidence? Does it suffice to truly convince me that your interpretation of it is correct? Is a blurry picture of a disc-shaped object in the sky a persuasive piece of evidence that the disc shaped object really is a vehicle able to travel interstellar space and is carrying members of an advanced alien civilization? I think we can agree that it isn’t persuasive evidence of that.
And I can’t just decide to be compelled by it against my nature.