I ain't buying superstar yet. Too young. Still struggles against lefty pitchers. But I agree with almost everything in the OP. Last year was Beni's sophomore slump year, and in it he was 2d on the Sox in total bases, 2d in runs scored, 4th in rbi's, 4th in dingers, 2d in SB's, etc. He is very close to being the proverbial five tool player: hits, hits with power, runs the bases, fields, and throws. He does not actually have a great arm.
As Dojji correctly points out, Beni also shows up ready to play every darn day. He is the complete anti-JD Drew.