Keith Law's take on Cowser last year this around this time: article here
"Cowser looks like he’ll be as advertised — a very solid, reliable regular, maybe a 55, but perhaps not a star. Cowser has very good feel to hit, at least against right-handed pitching, as he hit .307/.432/.530 off them, but struggled against lefties with a 33 percent strikeout rate and just a .194/.329/.287 line on the season. He took off when he reached Double A in late June, moving to a slightly better ballpark for left-handed hitters, and didn’t stop hitting until he reached Triple A in September, where he was overmatched by offspeed stuff of all varieties."