I think we've been moving to a more integrated development system. And Klentak has accelerated that process.
It's not that Kapler is going to take over, rather, you'll have a ML manager who understands the whole process, and wants to work with the development staff and ensure that everyone is on the same page. Often the manager is in "win now" mode and the GM is in "win soon" while the development guys are thinking long-term (what do I need to nuture 17-20 year olds). Having a manager, GM and development team that think in a similar fashion allows more consistency up and down the system.
Because Kapler understands the process, he can communicate what he wants in the "final product" to the development staff, so they're not working at cross purposes. And because he understands analytics, you won't get the "lot's of RBIs" BS we've gotten from some of the fossils. If someone is promoted with a bad baseball skill package (as opposed to talent package), Kapler is sure to send a message down the line that they're not coaching up key skills.
While some of the players may think he's a bit exotic, given this is a young team with kids struggling to stay in the majors, a 57th pick (which would be a UDFA today) who managed a ten year career is going to have a lot of credibility. The funny thing is, for all his embrace of analytics, Kapler only had 269 BB in 3315 PA, practice what I preach, not what I did!