I actually read a little about this after Klopp mentioned it. It's basically about muscle injury prevention. The idea is that those 5 minutes at the end of a game are the most dangerous for players who could be close to muscle fatigue. So if you have a chance to remove them from the game, you are drastically reducing their chance of injury, not just by a "marginal gains" perspective, but by a relatively large %age.I ended the game pretty nervous after their second goal when we should have been cruising. I agree that all the substitutions in final minutes caused sloppiness and confusion. TBH giving Rico fives minutes rest at the end seems pointless and gains very little. The end formation reminded me of the Barnsley game at end of last season when Thomas threw on so many subs it looked like no one knew where they were supposed to be playing. Anyway, minor quibble after another top performance
I'll be honest, I don't fully understand it, but there must be some sports science behind this considering the teams that rely most on analytics and science to do their work (see also England rugby) make these subs regularly.