Yeah, I see what your saying. It's the same strategy we tried with Chamakh. Space is in the wide areas and I can see that Walcott has stopped playing as a winger and Wenger now has him playing closer to the striker. He dribbles and carries the ball forward far less than he used to and it relates to Wenger telling him to study Ljunberg.
The problem with Ground, Welbeck and Chamakh is that they don't have that explosive movement in the box to worry defenders. They're movement doesn't create space for others. Giroud hardly moves. He'll make a pass and then admire his work. Also, they're not strong enough to be a battering ram like a Drogba type or Adebayor. Defenders don't fear or worry about marking them. That's the problem with it in practice although I understand the theory.
With someone like Sanchez or Theo up front, they lack the physical presence but they have the movement and energy. Playing short one twos in front of the opposition and they'll just ghost past the defenders. Similar to the false 9 Messi played, someone more nimble and quick can play between the lines and make up the ground to get back onto the box. I remember Gervinho played the role once and the movement and chances we created were dangerous.... but it was Gervinho! He couldn't finish.