I voted for 9-12. As it stands we have a decent enough squad when you consider Vlaar is still here and we have Benteke to come back. If we add a quality midfielder and a decent winger/second striker to the squad then we will be in a good position. I'd also like to see a decent left back added to the squad unless Richardson is gonna play there but he seems to be getting used in a more advanced role.
4-3-3
Guzan
Hutton - Okore - Vlaar - Richardson(new LB)
Westwood
(new CM) - Delph
N'zogbia Gabby(new winger)
Benteke
SUBS: Given, Senderos, Bacuna, El Ahmadi, Cole, Weimann, Kozak
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4-4-2
Guzan
Hutton - Okore - Vlaar - Ricahardson(new LB)
Westwood
(new CM) - Delph
N'zogbia
Benteke - Gabby
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3-5-2
Guzan
Okore - Vlaar - Senderos
Hutton Richardson(new LB)
(new CM) - Westwood - Delph
Benteke - Gabby
Add to that Bent, Grealish, Gardner, Clark, Baker and Robinson and we would have a decent squad. We will be fine!