I'm far from an expert....and I have my own opinion about the whole lesser/butter issue. But since you want to know why folks guessed as they did, I'll tell you my thoughts.
1. First picture I immediately thought "mojo" because of the somewhat "floaty" affect on the pattern, and the brown coloring that lacks any yellow. When I saw the second picture, I thought "HOT mojo!"Beautiful flames and blushing...but still looks like a mojo to me. The hints of yellow I see in the second picture aren't in the right place of the pattern to be a lesser.
2. I thought "lesser" right away when I saw the first picture. Beautiful faded blushing all along the back pattern and nice shadings of yellow in the alien heads. And what spots he has are light in color, rather than dark. To me, a butter shows a lot more yellow in the pattern and tend to be brighter than lessers....but I'm still not convinced they're actually two separate morphs, but rather, two variants of the same morph...just like normals can be light or dark or high yellow, but they're all still normals. That's just my inexperienced opinion, though.
3. Seems like most everyone agrees this one is mojo. Not a doubt in my mind when I saw the picture. Floaty pattern, rich brown colors, lots of light coloration/flames on the sides. Not quite as hot as #1...but definitely a beauty!