Reply To: Controversy In Israel – Woman says Sheva Brachos

According to the article the chosson and kallah said it simultaneous. So it was said by a man

Without question that would be invalid, as only one of them needs to make the bracha, the other would be a bracha l’vatalah.

Mesorah does not suffice?

No. We change Mesorah all the time, depending on who is is charge and the outcomes that they want. Besides, you would have to prove that such a Mesorah exists.