Good point. Seriously, how many of these "long time to bloomers" put it all together with their original organization? Can anybody remember many situations where an organization had a promising player reach the Majors, saw that promising player not fulfill his seeming destiny but that organization stuck it out for 5-6 years and eventually was rewarded for its patience when the player finally put it all together? I suppose you could say that Carlos Carrasco comes close as he began to blossom a full five seasons after the Indians acquired him in the Cliff Lee trade. But, otherwise, how many organizations were that patient with a guy and had that patience rewarded? Look at all the organizations and at bats that Jose Bautista (six organizations if you include the Mets who had him for a matter of minutes before passing him along to the Jays!), Marlon Byrd, Brandon Moss and Chris Davis went through before they put it together. After 2014, those guys were all used as exhibit a for why the Phillies needed to give Domonic Brown another chance in 2015. It's easy to look back with the benefit of hindsight and say a team should have been more patient and stuck it out for however long it took with a particular guy but, seriously, that's asking a lot. How often do guys bloom this well, this late?
Happ has changed uniforms four times since the Phillies traded him. Ray Searage, the guru pitching coach the Pirates have really seemed to spin some magic with Happ during the two months the Pirates had him last year. These are Happ's numbers in the little more than a year since the Pirates got him at the deadline from the Mariners: 22-5 W-L, 2.70 ERA, 200.1 IP, 60 ER, 168 H, 186 K 54 BB, 1.109 WHIP. Holy Cy Young candidate, Batman! Searage took a journeyman lefty and turned him into a bloody ace.
baseball-reference.com/players/h/happja01.shtml