If you truly want to be a specialist in big data analytics I think a statistics degree is more relevant.
9 out of 10 statisticians might agree. They'd be wrong, though. Few higher level degrees are relevant to non research work directly. Techniques change all the time, that's not why he should get another degree. He should get another degree to make him more easily hireable/promotable. Get an MBA, it's easy and all the kids are doing it.
To make a long story short, I don't take any responsibility for anything I post here. It's not news, it's not truth, it's not serious. It's parody. It's satire. It's bitter. It's angsty. Your mother's a whore. You like to jack off dogs. That's right, you heard me. You like to grab that dog by the bone and rub it like a ski pole. Your dad? Gay. Your priest? Straight. @#%^ off and let me post. It's not true, it's all in good fun. Now go away.