They almost always (always) stood beside each other, always at reach.
And even when they were 5 in number, it felt as though Z & H were in their own World. Just the two of them.
For instance, just look at their facial expressions in most of the pictures - they just mirror each other and I don't think it's intentional or well planned ahead. It's just how it is.
That's just how they're, I guess.
![](https://s2.save4k.ru/pic/9UqDL4_D5Hs/maxresdefault.jpg)