Aker just does not know how to keep his mouth shut unfortunately, and it's a trait of a person scorned to want to bite back at their enemy. Aker saw a chance to get one back and of course he leapt to it. Unlikely to be the last time Aker slams into the Doggies under the guise of footballing objectivity.
It's classless of him to point out that Johnson is injured and past it and a hinderance to your team, or "done" as he said it. Completely classless.
Classless or not, he has a perfectly reasonable case here. Johnson should have announced his retirement at his testimonial and rocket should only pick him on form. because atm he doesn't seem to be adding much to the side.