That's a strong statement to make. These are opinions, so neither of us are right or wrong, considering there's no factual evidence that can be gathered to quantify this.
Gaborik was the center piece of that offense. Was he built around in the same way Lundqvist was, no. But he was still 'the guy' when it came to the offense. When the Rangers signed him, they were signing him for that purpose. In my definition, that's someone they are building around.
Just because it's to a lesser extent than other players, doesn't mean it isn't so. And if we sign Panarin to a huge contract like you are proposing, it will be a similar situation, but for an even longer term.
Finally, I don't really see how a contract that is 40% longer in term is not much different. There is significantly less risk in signing a player to a 5 year deal, than a 7 year deal. Besides the fact that you are invested for a shorter period of time, the player is much easier to trade after year 2 or 3, if things don't work out and the implications of a buy-out are significantly less.