I may be wrong, wouldn't be the first time. Heat rises, and it migrates or wicks to cooler. How can that heat sink be any cooler?
I don't think inside a distributer gets as hot as outside underneath, but yeah... Once upon a time Fords 3.0 V6 was melting down pickups because that cap didn't have sufficient vent on the top. It was at the front of that engine but buried into a hot spot.
Then what ign' module doesn't have a history of heat related failures no matter where it was located?
I guess my main issue is the labor involved in R&R a failed module. Not IF but WHEN that happens. Good luck to all.