Also, while we don't see much of Johnny in action it could be summized that Johnny was more of the blue collar bread and butter, extortion, loansharking mould of wiseguy. Junior, while greedy, is clearly more into white collar crimes and might arguably have been a wiser man than Johnny. If Johnny was the popular, good looking brawn of the duo, Junior was the brains. We're told for example that Johnny was told to buy up land in Manhattan in the 70s but didn't "see it", the potential; the same properties later became Tronecca.