There are big differences. Whatever Pomeranz is, he is approaching or is in his prime. Beltre is at the end of his career and comes with a 2018 price tag of $18 million. Pomerance costs about $3 million/year and we have him under control for a few years, which is a very cheap price for a starting pitcher in your MLB rotation. Devers has a late 2017 -early 2018 exected arrival date. Espinoza is expected about 2020-21.