We don't play with three strikers, we play with one and we have two wide midfielders/wingers. Gabby + Weimann play those positions because they have the speed and stamina to get forward and support Benteke yet also get back to help Luna + Lowton.
If Benteke gets injured, the replacement will be Helenius, Gabby or Weimann.
If Gabby or Weimann gets injured, then their place will be taken by Tonev, Bacuna, Delph, Bowery, or Albrighton.
We have plenty of 'battlers' in the middle like Delph, El Ahmedi and Sylla. Westwood is sitting in there, mopping up and spreading the ball. No one who can play just in front of them with the creativity/trickery to unlock good defences. And if anyone thinks N'Zogbia is the answer, they need their head examined.