Even if it's the same, it doesn't really discard it. Physics is the same everywhere, so maybe this is good body structure.

But personally I am very skeptical about this alien stuff. 

 Especially when the dude presenting them has been debunked before for showing alien mummies that turned out to be human children.

I believe in aliens, otherwise, it's a massive waste of space, but it's going to have to be irrefutable, tangible evidence. 

 Oh, aliens probably exist, but the likelihood they are intelligent enough for space travel is close to 0%. Just look at how long life on earth has evolved and how many species there already were, then realize only one species got intelligent enough to understand what space even is.
Life may even be abundant, but it doesn't need to be smart. We may be an anomaly within an anomaly.

Though we are screwed if we find evidence of even a single microbe as its evidence that we haven't survived the hypothetical Great Filter. 

 I don't agree with that. In just 100 years, we went from using horses to sending a person to the moon. 

Given a thousand more years, we could become an intergalactic species, if not sooner. It's a very short period of time in terms of universe.

Agree, there are most probably aliens out there, I doubt they would crash on Earth if they possess the technology to travel between galaxies. 

 I'm unsure what the disagreement is. Nothing seems to conflict with what I posted. 

 It looks like a primate with cranial deformations to me. Maybe it was a birth defect or artificially made for cultural reasons. 

 Could have happened? Sure. Did happen? No. 

Why? We have never found a breakpoint in the evolutionary chain of animals that would suggest an "insertion" of a brand new species that has never had a parent in the evolutionary chain. 

Yes. Humans, plants, animals, bacteria, and fungii share a common ancestor. We can trace all living organisms back to that ancestor. 

If we were seeded, that common single-cell bacterium-like ancestor was the seed. That alien seed is so far away from primates that it would be virtually impossible for two separate evolutionary chains to end up with the same structure as primates, 4 billion years later.