Relative to this lineup, he's producing enough. I don't know what to tell you, I'm not concerned about him right now and anybody that wants to make any big judgments or development decisions about a 19 year old based on 3 weeks is wrong. I think he's doing well enough at this point to justify continuing his development at the MLB level.
.192 isn't producing enough for any lineup.
That said, I'm sure he'll continue to improve throughout his rookie season.