What it means is that you don't have to 'declare' your investor to be in play, or somehow 'play' your investor. They are all automatically in play on every deal. Obviously, some deals don't need all investors- but remember, the vacation and other cards only apply to cards 'in play' - so all investors are vulnerable on every deal.
In this case, what if someone play the vacation card or the recruitment card on the boss's investor card, the boss result be not part of the deal?
Thanks for answering