Pirates said in late August they weren't pursuing Sanchez which basically left the Mets as the favorite to sign him. The reason it took this long was his price was way too high
I thought I read it was his age investigation that was the primary delay.
I never heard names but there was a bunch of players who failed PED tests,he might've been on there,that was the initial explanation for a slow beginning to the signing period. According to Dejan and reported by Tim,his price tag was ridiculous and the Pirates had no interest and stopped pursuing him in late August.