Our expressive players are not afforded the same freedom as expressive players at other top teams.
Martial has all the talent in the world and has been reduced to fighting for his place for most of Mourinho's tenure; the implication being he needs to work harder off the ball. The expectations are very different and has even filtered through to some sections of the support who are critical of some attacking players who don't track back to a sufficient standard. It's barmy.
Purely subjective as this is based on individual observations. Martial's output has been better than last season, and it is only November. Certain aspects of his game are not yet well-developed, but he's young and at the moment, is playing as we expect him to. We shouldn't be putting pressure on him to be the game-changer yet, that should come in a couple of seasons.
Salah's success isn't because of Klopp but it certainly helps that he's well suited to his fast, high intensity system - just as it does with Mane and Firmino.
Mourinho chose Willian over Salah at Chelsea and I'm sure he would again now. His preference for the industrious types trump flamboyance.
Firstly, I have watched a bit of Liverpool this season and they are not even playing a fast, high intensity system this season. For some reason, Klopp has put the brakes on his harem-scarem pressing.
Secondly, if a winger is fast and scores goals, he is suited to any system - counter-attacking, defensive or high-intensity pressing. A winger is not some specialist position like midfield, where you have a ball-winner (more suited to a defensive system like Conte's) or a deep-lying playmaker (better suited to ours). The only system which might require something more from a winger besides pace and goals is possession based system, where an obsessive coach like LvG or Guardiola might not want their players giving the ball away.
Simply put, he's a winger who is fast and scores goals. Any manager would happily take him or Mane, it has nothing to do with any system.
Btw, Mourinho makes mistakes, but there's no doubt he would have Salah or De Bruyne now. His weakness is a liking for players who follow instructions to a tee. The likes of Fellaini, Willian and Lingard do that, which explains it more than his preference for a type of winger.