#3 Taming "difficult" players
During his time at OGC Nice, Favre had one of the hardest jobs to perform on earth - manage Mario Balotelli. Where Jose Mourinho, Jürgen Klopp, Roberto Mancini, and a host of others tried and largely failed, Favre succeeded in taming the beast in Balotelli.
There has been a similar situation in Manchester United with Paul Pogba, as Mourinho has been unable to man manage him, and has suffered numerous fall-outs with him. However, Favre could be the right man to bring the best out of Pogba, and hence make him a world beater.
Final thoughts
As a manager, Lucien Favre is a perfect blend of tactical & man management skills, and he could be the perfect manager to bring the glory days back to Manchester United.