The team aren’t as fit as they should be that’s pretty clear and that’s on the previous clown we had.
That said, these players still need to learn to be a bit more ruthless in those 2-0 type situations. That must never slip, it could have today.
I said this in another thread.
A player cannot blame his fitness level on a previous manager. The player should take pride in his own fitness and if the current regime is not stipulating a high level of fitness, then it's up to the individual to do extra fitness work in his own time.
Some people retorted to my comment, and said that the coaches in the club, will specify and training program. My answer to that, would be (the player should tell the coach), "okay guv, I can do all you have asked, but I feel that I am getting tired in matches and also a bit fat. Would it be okay for me to do extra running, after training sessions to improve my condition?" No coach his right mind, would say "no". Coaches love athletes who are willing to work harder.
I remember Ronaldo used to do extra training, because he not only wanted to look good, but he wanted to be the best. So after all other players had gone home, he stayed back for extra training.
What I suspect is that some players may have lacked motivation and could not motivate themselves to stay in peak condition. When the new manager arrived and asked them to run a lot, their bodies/minds are struggling to handle the work load (even after 5 weeks).
In any case, players need to take ownership of their own fitness and not blame it on somebody else, who apparently prevented them from improving their fitness.