Although Benteke was a decent source of goals no one else in recent seasons has been so other than him there isn't a lot to replace (in theory).
Ayew, Gestede, Sinclair and Kozak plus Gabby would need to provide us with 25-30+ league goals which doesn't seem to be out of the question and a midfield of Traore, Gil, Grealish plus Veretout/Bacuna certainly looks to have more goals in it than the Cleverley, Delph, Westwood combination of last season - and not simply because there is 5 of them rather than 3!
Lescott and Richards have historically had the knack of scoring the odd goal too which would also make a difference so not losing too much sleep that we missed out on the Adebayor loon!