Originally Posted by
Beakor
If an engine stays in reverse, safe flight is not possible.”
I think that part is the key of the statement - "If an engine stays in reverse".
As I noted previously, Boeing reverser design has been changed so that - baring a failure - the reversers won't stay in reverse even after liftoff, they will continue the stow cycle until they are stowed and locked.
That wasn't the case with Cranbrook - where as soon as air/ground went 'air', all power was removed from the reverser and it was unable to complete the stow cycle.