Dear confused:
If you have to ask...well, nevermind.
I'd say this is personal preference. You've devised a tactic yourself so it's fine. Surely a manager could take his tactic from one team to another.
As you said, it might not work, especially depending on the players you have available. Managers will always have a style of play that they use (given the right personnel, ofc).
From the amount of games some of us have played, if we had to come up with different tactics each time we'd be playing with a left sided sweeper...oh, wait. :o
It's your game. I imagine the tactic wil change somewhat with different players and results in any case.