My vault #422 has 135 dwellers. I have the happiness at a firm 99%. The problem is I have 8 new dwellers outside my vault waiting to come in. I have no use for them. But I have to keep the radio up to keep happiness high. My question is, if I let one in and send him immediately out to the wasteland to die, will it lower the happiness rating in the vault, due to him/her coming in briefly at a 50% happiness rating?