It's a fun thought-exercise, isn't it? I think it's very possible that alien species inhabiting physical bodies who've been able to escape their blue-zone home planets are likely more like us than not. If we analyze the evolutionary trajectory of our species too it's not too far out of the realm of possibility that we're evolving to be more "grey-like", with larger heads, more fragile bodies, and telepathic communication. I think the complication in regard to communication would be emotions. Humans thrive and feed off emotions but highly advanced aliens would have likely engineered emotion out of their species.

Considering how many intelligent non-hominoid species we have on Earth it's also possible that alien evolution could have gone down this path on other blue-zone planets as well but it's unlikely they would be able to escape their planet without the ability to make tools and later build and engineer.

The thought of this all has fascinated me since my earliest memory.