I would seriously give him his debut away on Monday night, playing against Arsenal we obviously aren't going to control the ball but we will get chances, as we have seen in Arsenal's first two games v West Ham and Palace. Even though we lost 4-1 last April, we actually had chances early on in that match, if Sterling could finish and if Markovic could lay on a simple pass then we could of been leading that game.
I think we will need more around Benteke when we do have the ball in Arsenal's half, we need to have some runners ahead of Henderson and Milner and not just Ibe and Lallana trying to give us width and fire it into Benteke or cut back in and give Coutinho a square ball, we need runners in behind Mertesacker and Koscielny, and that is what Ings is brilliant at. His movement is really good!
Return of the diamond for me on Monday, bring Ings in up top with Benteke.