Colby has a career .327 wOBA as a CF, Smoak has a career .308 wOBA as a 1B. Colby is an above average hitter at his position, Smoak is a below average hitter for his position, although his power has played well this year. Given 500 PAs, I think Smoak can easily hit 20-25 HR playing half his games at RC. I don't really see anything that leads me to believe a larger breakout is coming though, he's a flawed hitter with good power, that's it.