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Marc Albrighton is a traditional No. 7—hit the byline, get it in the mixer. He's been injured for huge chunks of this campaign since hurting his foot in preseason and Charles N'Zogbia has also struggled for fitness.
That left Paul Lambert with just one fit winger in Brett Holman, so the 3-5-2 was a natural fit considering the medical bills piling up on an unfortunate Aston Villa side.
Now N'Zogbia is back, Gabby Agbonlahor looks comfortable on the left and Andi Weimann is forging an understanding with Matthew Lowton on the right, however, you see key performers benched if you choose to field the three-man defensive system.
The 3-5-2 sees "Zoggie" move inside into an incredibly important role, while one of Villa's key forwards is benched. Holman is moved to central midfield where he struggles to keep pace.
If you've got fit wide men, these compromises aren't necessary.