A player that drops deep, dribbles and looks for the killer pass is the last thing that we need. Most of Giroud's creative play aren't even flick ons and knockdowns. It's that he's a very polished player with his feet. We already have sooo many of the player you're describing. We have Alexis, Cazorla, Özil, Wilshere, Rosicky etc. If we were to sign a striker, he would have to be a 'killer striker' as Jose Mourinho calls it. Absolutely ruthless in front of goal.
Why chase Benzema then? If you only need a player that can finish, why chase such a well sought after player and pay so much more for the playmaking abilities of a striker when you don't need them?