ScruffyNerfHerder said:

It’s also another way to tempt Luke. If you remember, Vader only tortured everyone on Cloud City so that Luke could sense their pain and fall into his trap. The emotional turmoil over the Carbon Freezing is yet another lure.

Indeed, THIS did tessellate. Well, of course it should have been so obvious earlier. But here one moment of questionable participance of Harrison in ROTJ appears: after they turned Han's body into the piece of Carbonized Ice, Lando squatted down and after a brief revision of life gauges, stated that "he's alive". So, if Han survived wasn't it somehow connected to the fact that Ford was viewed as a member of the cast on ROTJ set?