I don't think it's just Oakley. Wilson out means we can't play Crawford high up and we lose out in the middle too. I think we'd have been fine with one or the other but not both so it's a bit unlucky.
We do need a bigger squad but Imrie is right when he says its very fine margins. I'd love us to have a bigger squad with cover for every position but, if we're realistic, we need to accept injuries to key players will hit us harder than other teams and the budget only goes so far.
There's an argument that we should be able to adjust and use the squad but a more flexible squad more often than not means poorer quality in a player's best positions. I think I'd rather see better players that aren't as adaptable than players with less ability that are but that's basically what the choice is. The highs will be higher and the lows will be lower with what we have but the alternative is probably a bit boring.