Yeah, think that's the downside to have both inverted fullbacks.. your wing fwds are pushed wide and the CMs occupy the (more dangerous) half-space positions, there is a fluidity of positions in general, but still that's for the most part their starting point.
That's why I'm hoping Vieira can prove himself in the coming weeks/months (really liked what I seen so far) and take the 8 position, a player like him would make us a lot more dangerous in the attack, if he is up to scratch in the other side of the game as well