I don't understand the concern that Vardy isn't the CF we need, and I think people are getting too hung up on the relative styles of play and aren't seeing the forest for the trees.
In many ways I suspect that Vardy is being signed for similar reasons as to Ozil. Most thought/think of Ozil for his assists, but I don't think AW has ever talked about this other than in terms of our lack of efficiency. IIRC AW talked of Ozil in terms of his efficiency with the ball in the final 3rd and his technical abilities on the ball as an ability to help retain control and possession.
Similary with Vardy everyone is thinking of how Leicester played compared to our style last summer, and not of the attributes of Vardy as a player = pace, directness, movement, determination, work rate and finishing. If Giroud was essentially signed as a Plan B option, then Vardy is a combination of the best attributes of the players AW has looked at to become the Plan A options - Podolski, Walcott & Welbeck. As such I suspect that Vardy is very much the style of CF AW has wanted for Plan A since RVP departed, and we may be about to see what the Plan A was intended to be for the first time since RVP's departure.
I also note that we have been linked to several Plan B types in Janssen, Slimani and Colak, and I wonder if AW will enable Giroud to depart to play as the Plan A at another club.