Money is not the reason why getting Nolito makes getting Auba unlikely. Squad availability is. If we get Nolito and Sane, plus Sterling and Navas we now have a 4 at the wing forward position. And this doesn't even include Silva DeBryune and Nasri who can all be deployed in those areas. It is this consideration that makes getting Auba less likely.Speculation.
I don't see how a signing around £14 million affects us acquiring Aubameyang, even if we do end up coughing up £40+ million for Sane.
Pep will basically have a blank cheque to get who he wants. And he's as big a squad rotator as any manager in the game, so it's not unthinkable he'd have multiple signings for similar roles.
In short: don't give up on Aubameyang yet.
Perhaps a better way to put it will be this: if we get Nolito, then one of Sane or Auba isn't coming. We simply aren't buying 3 wing forwards.