No need to drop either Ings or Ollie, they could play very successfully in the same team, even in the 4-2-3-1. Ings playing in the centre of the 3, with Bailey and Buendia either side would give a lot of chances to Ollie and with Ings there to pick up any loose balls, sounds good.
As for El Ghazi, Wesley, Davis and Trez, probably best for them to move on as we improve the quality in the squad.
Obviously Trez will not be moved on until he's over his injury but, Anwar could be moved on today. Roma want him for £15m, although I'd want add ons, like a friendly pre-season game at Villa Park for the next 5 years.
Wesley and Davis must go out on loan, which would hopefully increase what anyone would be willing to pay for them.
As for us getting Tuanzebe on loan, I'd only be interested if we got an option to buy for a set amount, say £10m.