Джейн, это речь самого шафера, т.е. "Его (свой!) речь (в качестве шафера)"

Does that make sense?

I thought it's like "Jack's best man speech" (if we replace the pronoun "his" for the name Jack). A speech of Jack's best man... Isn't it what the English implies?

Because if yes, then my translation is correct.

А, я врубилась! Речь его шафера = His best man's speech. Его речь шафера (в качестве шафера) = his best man speech.

Thanks, it's my mistake!

And yes, that definitely did make sense!))

Cool 😎