Can't you see that in PES 16 in every goal the keepers have a slower animation compared to their diving saves? This means the whole shooting-to-goal sequence is scripted and hardcoded. I challenge a KONAMI PES dev to come here and prove me wrong. The game clearly "decides" when a goal will occur and that's why we see the same slow animation/slow reaction everytime.
FIFA had the same scripted goal many years ago.