I was having this same discussion with someone else. What I believe is that sometimes you have to take risks like these, pay $10 million now in order to get someone who has the chance to be a stud at the Major League level. Dayan has a lot of talent, and I'm willing to give him more than one year to harness it. We gave Borchard, Fields, Anderson, etc. more than a year. Sure, we didn't spend that much on them, but we gave them all ample chances.
If in a season or two we don't see any growth, then start raising the questions of him being a bust. From what Voodoo pointed to, he has shown improvement already.