One of the beautiful things about baseball is that success can come in all shapes and sizes. It's the professional sport of physical diversity and inclusion. Altuve, Judge, Bartolo Colon, Jim Abbott, Eddie Gaedel, Pete Gray, Satchel Paige, Jamie Moyer, Moe Berg, Pat Venditte, RA Dickey, Phil Niekro, and every other knuckler, etc. etc. etc.
I don't think Kirk owes any kind of debt to the Blue Jays. They've probably paid him like, $50,000 total during his four years of professional employment.
There's also an argument to be made for not fixing what isn't broken. MLB has a history of fat catchers, so there might be some unexpected merit to playing fat. He's a bigger target back there! It helps him block the plate! Maybe hitting fat helps with power a little bit?
#PlayFat