measurable factor = giolito is a better pitching prospect than cueto ever was
measurable factor = giolito is one of, if not the single best, top pitching prospects right now
measurable factor = giolito is younger than cueto
measurable factor = all of this stuff http://www.fangraphs.com/blogs/pitcher-aging-curves-starters-and-relievers/
measurable factor = johnny cueto is ranked #25 out of all SP eligible players when accounting for ERA, WHIP, SO. thats barely a #1 starter in a 30 team league. he gets bumped up to #16 if you include WINs but everyone knows wins are fluky as hell for pitchers so they arent very reliable.