Well, Kris Bryant hit 43 Homers with .325 average in the minors (AA and AAA) last year at the age of 22. Sano has 15 homers so far in AA, and missed all of last year due to injury. I think a better comp for expectations might be Kyle Schwarber, who has 13 Homers in AA this year and just had his cup of coffee. I think some guys are once in a generation, once in a lifetime talents - and some guys are just really good. With Buxton vs. Correa, Terry Ryan has said that Buxton's bat is his least refined tool. He was comparing the two guys just before Buxton was called up and said that Correa has a better bat today, but Buxton is faster, has a better arm, plays better defense, and has the athleticism and desire to improve his hitting to a point where it could surpass Correa. The expectations that Buxton would be a great defender and a burner on the bases were met - his hitting may have been oversold by some. Every prospect is going to bring different things to the table, Bryant (and Sano and Joey Gallo) are bringing raw power, Buxton is bringing speed and defense first.