and he struck out at a 30% clip in the minors last year
This is simply incorrect. He struck out in 26.9% of his at bats, which while still high, was raised significantly by his stint at AAA. Prior to AAA in 2011, his highest K% at any level (of more than 4 games) is 25%, and that includes his stint at A+ in 2010 when he struck out 20.2% of the time, and in AA in 2010 when he struck out 23.5% of the time, much more respectable numbers. Even though he did strike out more in AA last year (24.9%), it is not such a large number to be completely concerned about his ability to hit for average. People are running WILD with his AAA K%, which his career shows is likely an outlier (yes, I realize as levels increase in difficulty it is not uncommon to see an increase in K%, but 5% is unheard of).
It is completely reasonable to assume that Jackson can put up something similar to a .270/.370/.430/.800 line in the majors while playing average CF defense or above average corner outfield defense (possibly well above average). I think you're discounting his potential by looking at 200 ABs from last year.
And that's not to say I like Jackson considerably more than Rizzo, I just wanted to make sure the information was accurate.