Van Persie as a lone striker? Why not?

If there was one element of our new 4-3-3 formation that nobody had predicted at the start of the season it was the use of Robin Van Persie as the central striker and Nicholas Bendtner as a right sided forward. I'm sure that for many gooners, like myself, this was unfathomable; it just literally never crossed my mind that Wenger might play like this.