Gose is not MLB proven and his minor league numbers do not suggest he is going to be anything special with the bat. Prospects bust more often than not and then people are left scratching their heads at what happened. On the defensive end he should be stellar, offensively who knows.
It's fine to take a chance on him in CF if we can get a good return for Rasmus for another position of need like 2B, but realistically, Gose is probably never going the be anything more than a bottom of the order bat, or a poor leadoff hitter.