You could look at Le Fondre as an example / comparison. Some would argue he is ripping up the A league with 16 goals in 27 games.
He had a pretty solid championship level career with some time spent in lower leagues. Similar to Ifill.
So you would expect League One players to be pretty solid performers at A league level. Would like to see the club aiming a bit higher than this for a striker tho, especially if they have the money that they were going to use on Roy still available.
Le Fondre also had a solid season in the Premier League. Ball would be comparable to a Greenacre signing, a guy you'd expect honest and professional performances from, but not someone likely to knock in 15 goals a season. So if he is the guy, you'd very much hope that there'd be another import signed to play alongside him (i.e. another Ifill to his Greenacre).