Its the same logic like Modric, he can't play blah blah in 4-4-2, you are definitely overrating 4-4-2.
If Gibbo can do it for us, why can't a world class MF who has played for Ajax, RM, and Inter not do a job for us ?
4-4-2 is about position, passing, stamina and vision, Sneijder has all the qualities and he even puts in a good defensive shift when needed...
Who knows ? He might even be more effective playing in 4-4-2 than 4-3-3 as he will get more of the ball.
We will definitely see more of him if we do get him, but I am willing to bet it all that he can definitely do a great job for us.
A great player like Sneijder can play everywhere, but he hasn't got defensive skills or a particular pace, stamina. Useless playing with him 50 meters far from the goal
Modric is another world, with other characteristics, he has scored 8 goals since 2008...