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I still like Jaku in the rotation for exactly those reasons.
He already has a nice fastball and good command of it, it seems to me he could really benefit from mixing his pitches up more.
Olson has an inferior fastball, inferior fastball command, inferior offspeed command, an inferior curveball, but a better change. The ONLY thing hes got on Jaku is that he mixes his pitches up more often which has led to a better SwS%.
Jaku throws his fastball 75.6% of the time. He is EXTREMELY easy to get a read on unless he starts mixing the curve/change more. My guess is that this was EXACTLY the same approach he took in the minors which is why his strikeout rates have always been low, but his results have always been good (relying on good fastball command).
Even so, results-wise Jaku has outperformed Olson in the rotation. Jaku had a 4.59 tRA in the rotation against Olson's 7.96.