It's the third issue. We aren't supposed to know the inside and out of those characters. If they were just brand new character, nobody would ask that of them already. But because they are the LoSH, a lot of people who read the previous series and loved them (and that's great) are actually wanting Bendis to write their Legion and thus ask for those characters to already be distinct in ways the older version grew into.

It's simply not fair to ask that of the book, especially when it also has to actually propose a new and bold futuristic vision, instead of the 60's or 70's which have grown extremely stale nowadays.