I have not foiled individual thighs but like said have done foiled pan of sauce.
I have turned in thighs with out skin they were rubbed and cooked with the skin on then I took the skin off and sauced. We did not score any better or worse than normal we did that our first year though so I might actually try it again and see how it goes since we have a better recipe now. I like having the skin on during the cook to help protect the meat and keep it moist.
Butts A Fire BBQ Team
Pro Q Excel 20