Definately. But on the other side of the coin you need the players that are comfortable playing that system. What players you have - especially when you are not backed by your board to buy players - should dictate the system not the other way around. People like Delph, Dunne and N'Zogbia can't pass a ball and Bent can't play up front on his own....
Isn't this what pre-season is for?
I disagree on Delph, when fit I think he's a decent passer of the ball, against Man U a few years a go, he looked great in the centre of the park passing the ball, admittedly that was a while back, but injuries haven't helped him.
Dunne, can't play this system i agree, and N'Zogbia has been dreadful considering his price. Some players have to go, and these maybe some of them, some will come in, the team was never going to be built in one window, especially one with 10 days still to go...
For me pre season is about fitness primarily, there's only so much you can learn tactically in non-competitive games i think.