Just to put the hypothesis out there: because he's a fall guy to placate the people afraid of being killed like the UHC CEO, which the authorities desperately need.
(Although a brief perusal of the photos in the article doesn't show anything obviously different between them.)
You would probably want the fall guy to be someone who can't defend themselves easily, like someone with substance abuse issues and prior convictions, not an attractive 26 year old valedictorian with an affluent family.
This seems extremely unlikely in practice considering how many people would need to play along. Also what happens if more evidence appears afterwards or the actual killer gives himself up? You just end up playing whack a mole to keep the lie working. No it really doesn't make sense.
Not saying it's impossible but in those cases they need to A) know who the real killer actually is, and B) kill/suicide the fall guy.
(Although a brief perusal of the photos in the article doesn't show anything obviously different between them.)