I'm not sure Crowden is a small forward despite being shoehorned in there when given a run. In any case, we have an over abundance of small forwards already in the side so replacing Switta with another seems redundant. With Sonny, Henry, Schultz, Colyer and even Banfield, surely we want someone who isn't a small forward coming in.
I still don't like playing two slow, lumbering ruckman, I'm not sure I can think of any game where that's worked well tactically. At least one of them needs to be mobile and able to get around the ground well. Darcy has been amazing with his tap work and should be good to go, while Meek offers little forward (and not too much impact in the ruck either). I'd rather play a smaller forwardline than two lumbering ruckman. Let tabs and Treacy run riot and be the focus forward.