There are people with more expertise than me on this at VN, but ...
(A) We don't run a West Coast offense,
(B) With all due respect to the OP, I believe he is mis-defining West Coast offense [though, the definition has become a bit confused over time]
(C) Don't think that having a West Coast offense would change our emphasis on defense.
On a very a basic level, the West Coast offense is meant to protect against a big pass rush. WC Offense focuses on a short passing game to make the pass rush less effective, make play-calling less predictable, and open up the field for bigger plays later on.
Our offense (I've normally seen it called the "power spread" here) has a similar goal to help neutralize a strong pass rush, but with a bigger emphasis on misdirection type running plays (e.g. zone read) than the WC offense.
Unfortunately, our offense wasn't very successful in achieving its goals much of last season. This was partly because a lack of experience and talent at several positions. It was also because we lacked the personnel and knowledge to make it work. Hence, our "zone read" became fairly predictable, and defenses knew exactly where to focus their efforts.
I think Butch knew all of this going in last season, but he was looking at the long-term. By implementing his system right away, it would make it easier to run in Year 2 and beyond. It would also allow recruits to see exactly the direction we were going with the offense, so Butch could better recruit the type of players we need in the future.
And yes, for those more knowledgeable than me, feel free to correct any misconceptions I have. I try to understand what I can about offensive and defensive strategies, but I also have a day job