A few things on this.
#1 the big receivers don't win Superbowls.
#2 The Seahawks do not throw the ball enough to justify a Big Receiver.
#3 The Seahawks do a great job finding the underappreciated, overlooked WRs the play with a chip. I say that is the way to keep doing it.
The Seahawks & Patriots have this right. You want those scrappy smaller guys that are underpaid and pissed off. Not the divas that make all of the money and complain. They tried with Graham & Harvin, it just doesn't work with how the Hawks operate.
This upcoming draft though I would be more focused on adding defense. The offense will be fine going forward with some slight tweaks to the scheme. They are bringing pretty much everyone back on O next year outside of Mike Davis.