Truly they are no longer the same. But it would be too early to rule them out already. Remember the whole team was built around Cristiano Ronaldo and when he left, he left a huge vacuum in the team, a herculean task to fill. 

They got young players that are eager to play and what they need now is to up their game and confidence level. Its real madrid we are talking about! They will definitely bounce back but it might take quite some time to. 

As for zidane, i guess the love for the club brought him back. If i were him, honestly i would have left when the ovation was loudest and maybe, return in the years to come. Now they need to be focused like never before!