I find the common envelope ( CE ) energy formalism , the CE \alpha -prescription , to be inadequate to predict the final orbital separation of the CE evolution in massive envelopes .
I find that when the orbital separation decreases to \sim 10 times the final orbital separation predicted by the CE \alpha -prescription , the companion has not enough mass in its vicinity to carry away its angular momentum .
The core-secondary binary system must get rid of its angular momentum by interacting with mass further out .
The binary system interacts gravitationally with a rapidly-rotating flat envelope , in a situation that resembles planet-migration in protoplanetary disks .
The envelope convection of the giant carries energy and angular momentum outward .
The basic assumption of the CE \alpha -prescription , that the binary system ’ s gravitational energy goes to unbind the envelope , breaks down .
Based on that , I claim that merger is a common outcome of the CE evolution of AGB and red super-giants stars with an envelope to secondary mass ratio of M _ { env } / M _ { 2 } \gtrsim 5 .
I discuss some other puzzling observations that might be explained by the migration and merger processes .