Legendary Card Game Kingpin card Pull the Strings
You would play that card and gain a new recruit to your hand right away.

I think it is worded this way to differentiate between gaining a new recruit through a purchase and gaining it as the result of another card either purchased or gained through fight.

Also think of it as a way to keep it clear that the first part of the card still applies to all other cards played this turn or if other things trigger from gaining a new recruit that may be added in the future.