The time it takes to restart is governed by the core inertia (HPT/HPC) being able to presurize the combustor to hold a flame. After that it is accel time limited.
I don't see the relationship in this thread of bringing in the Delta B767 since the core (HPT) hadn't spun down very much.
It's kind of subjective to argue good-better-best for products that all meet the same regulation and customer satisfaction levels as-installed.