Potential ebay scam?

Hey everyone, I have a high value Yugioh card that my brother is selling for me through his ebay store. The thing is, the buyer is from Germany and wants to have a friend in New Jersey buy it for him to have eBay authenticate it and then he'll ship it to him in Germany. Both people have good feedback (doesnt really matter these days) but on such a high value item and a weird scenario, im having second thoughts. Heres the message chain my brother had with them both: