once again your getting stuck on what number they have on their backs
No mate, I'm the one that tells
you not to get caught up in what number they're wearing.
I said blokes who can't tackle or wrestle shouldn't be defending in the middle third. That's got nothing to do with what number they're wearing, but there needs to be four defenders in the middle.
good coaches can find the right fit for special players without playing them in their traditional roles.
Even a shit coach can find the right fit for a player. There's really not a wide range of shit to do on a footy field, and it's all been tried before.
For every positive there's a negative. For example, if you play a bloke out wide you can make the most of his speed and/or ability to beat a defender one-on-one. But then he won't be able to get involved as much as if he was playing in the middle. If you play him in the middle he can get more involved, but then it's easier for the defence to throw numbers at him.
And so on.
Now, I assume you're implying that a good dummy half should be able to attack at 9 but if he's not a good defender then a good coach would hide him in defence, and I agree that's a good idea in isolation. But remember there's only so many defenders you can hide on the field before you run out of places to hide them.
If your hooker is defending three in on one side of the field (or wider) then you need to find another bloke to defend in the middle (to make up the four man central defensive group that every coach uses). And that bloke has to be able to attack somewhere on the edge. The logical choice is to use an edge forward (so he would defend in the middle but attack on the edge).
Come to think of it, it's a pretty good idea. And I'm as shit a coach as any merkin.
Edit: Actually it is a shit idea. If you remove an edge forward from one side of the field and replace him with a dummy half that you're trying to hide, then you have one edge defensive group that consists of a winger, a centre, a half, and the weak defending hooker.