To be fair, you're probably right. For all we know, Teo worked independently and developed 100% on his own. Maybe he went to a hitting specialist lab (driveline equivalent) during the offseason and the Jays deserve no credit. Then again, we don't know which players are even willing to accept help from the organization. There are certainly ones who go on their own path and do what they want in the offseason (and during the season). Easy to say the organization has to do a better job of engaging them and helping them see the value of training with the team, in their facility, with their staff - but not everyone will. And things will change in the players lives (family, kids, cocaine, whores) that may change a players work habits.
Pretty tough for standard fans to have any strong opinion on whether the Jays are doing a good job with development or not as there are so many different factors involved. The new state of the art facility has to help, but it will take more than a couple of years to see the results. I think they deserve a lot of kudos for making that happen. As for the results at the ML level - let's be honest, we're in a winning window right now and have been selling prospects to help the big club. This isn't rocket science. That said, we do have a lot of home grown talent on the roster. I think some fans have unrealistic expectations.