I didn't know that, so it's good insight.
For me, there's a clear difference between Pep's almost robotic system and how Emery sends his teams out.
There's the requirement for tactical understanding and discipline, but there also seems to be a lot of trust in the individual to express themselves.
In some respects, that may be even harder. When to deploy the instructions and when to trust your instincts.
As Bailey proves, though, if you can figure it out the results are outstanding.