I'm Doug, and I'm sorry to hear of the confusion. My goal is to provide you with excellent service today.
It is not possible for a wife to apply for a spouse benefit if her husband is not already taking his social security retirement benefit.
However, when a wife is eligible to take a spouse benefit because her husband is already receiving his, her benefit has absolutely no effect on his benefit. A retirement benefit and a spouse benefit are separate benefits and one does not effect the other---aside from the fact that one must be already collecting their retirement benefit before their spouse can apply for a spouse benefit.
However, if you are divorced from the husband that you want to claim a spouse benefit against, and you were married at least 10 years, divorced for at least 2 years and your ex-husband is at least 62, then yes you may apply for an ex-spouse benefit and it will have no effect on your ex's own benefit when he finally applies for it. The fact that the ex-husband remarries has no effect on the ex-wife being able to claim her ex-spouse benefit.
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I wish you and yours well in the New Year,