Hello,
Really nice to see an HT result after 10 years. May I know how recent did your temples started thin? If it happened quite suddenly, it might not be because of DHT. What I’m thinking is a synchronized telogen phase for your transplanted hair or telogen effluvium. Your non-transplanted hair was thick so if telogen effluvium happened, they might still look thick. But your transplanted area wasn’t really thick, so after TE the area looks thin.
If it has been thinning for a while and your hair thinned slowly, then it’s another atory. And please take my opinion witha grain of salt, I’m not a doctor.