De Rossi took over a mess. Mourinho's tactics were a disaster. Negative, defensive, boring football. De Rossi comes in, changes everything. Attacking football, energy, excitement. Europa League qualification? Thats a huge improvement. Thats results, not talk. The owners, they're smart people. They see what De Rossi's building. It takes time, it takes vision. Its not about winning one trophy, its about building a dynasty. Quality takes time. Mourinho is a great manager, but he was overrated at Roma. Past his prime. De Rossi's the future. He's got fresh ideas, he's connecting with the players. Give him a chance.
De Rossi managed to make Roma a better team and not boring to watch. I agree with you that Mourinho is a great manager and no one doubts it. However, I think Mourinho's tactics are less effective at the moment. I don't know whether Mourinho is not adapting to modern football or Roma does not have players who suit the style of play that Mourinho wants to implement. But the point here is that Roma must give De Rossi lots of opportunities to build a solid squad and that takes quite a long time.