It's difficult to understand, but it's something Pep has to fix.
Against Leicester, nobody reacted to anything from kickoff. The first goal was like everyone could stop & have a cigarette once Kolarov booted the ball away 'that's the job done'.
They will have worked on not being caught like that, all week. DeBruyne, v Arsenal, just lets them go & again, the defence just stand about watching, nobody sees anything. Walcott's run was a new thing from an Arsenal attack ? They rarely do anything else.
It's Pep's job to fix that, be it with his managerial ability or in the case of repeat offenders, sackings.
There's a lot to be said regarding the Leicester match, in terms of tactical preparation for example, but in the context of this particular thread I'll say that it occured in the aftermath of the Chelsea match. It is clear the team was still suffering, it hadn't recovered. That fucking match (vs Chelsea I mean) killed us psychologically, the way we lost, what happened in the end etc. Whatever the manager tried in the meantime clearly didn't work, perhaps he himself underestimated the consequences. There is no excuse, I agree, yet it's human. A human reaction...
Regarding the Arsenal goal: Kevin loses concentration for a moment, when Belerin starts developping he's already gone. When he passes the ball to Sanchez, there's a moment of hesitation by Nico (an instinctive reaction probably, thinking Sanchez is entering / about to enter Kolarov's zone: area of Kola's responsibility) which leads to confusion, lack of coordination between the two. Aleks will freeze, Sanchez will afford the time to set up Walcott in the box exploiting his off ball movement, our both DCs are neutralized. Everything happens very quickly, it's an excellent combination...
Of course Aleks has a serious issue with evading challenges, it follows him throughout his carreer. His psychology is vulrenable, he feels insecure defensively etc. And Guardiola is very careful in his approach, he respects his players as human beings, he is not Murinio. He tries to influence them, to inspire them if you will, in an indirect, subtle manner. The same with Clichy, the only player in the squad experiencing Guardiola's arrival as a shock (everybody else sees it as a challenge I think, players enjoy the experience), Gael's low self-esteem is more than obvious. Pep feels if he pushes them too hard, he could lose them permanently, it could kill their confidence completely. Personally I believe they both understand what is required by them, they both are good lads and try hard, it's obvious, yet it's difficult to cure / handle personality characteristics when you're past 30...
That's why I believe in the support of the fans, it can be crucial regarding the mental aspect. People have to be patient and show faith. All players give their best, their commitment and fighting spirit are amazing, even moving at times. It hasn't exactly been a walk in the park so far, still we're up there fighting in all fronts -and everything is still open. As already has been mentioned by members in here, it could have been much much more complicated, it's extraordinary the way the team has recovered from the Chelsea shock in just 2 weeks, while playing without key players, lacking options in certain positions, with Guardiola "reinventing" (tactically speaking) people like Yaya or KDB. I have seen defeats like the one mentioned above actually fuck teams for good.
Some recent examples:
1. United: Still struggling to recover from their early defeat by us in OT. Only recently trying to build a momentum, have already paid a huge price though.
2. PSG: Their early defeat at Monaco was a shock, realising they're not invincible. A lot of similar stuff followed in the process, still searching for stability, currently 3rd in Ligue 1. If they don't win it (personally I hope they don't), Emery should resign. Taking the initiative himself, not waiting to get sacked. That is, if he has any sense of decency...
3. Sporting CP: They got a lot of things wrong in their transfer strategy during the summer (like we did ourselves), mentally speaking however, they never recovered from that early undeserved defeat in the Bernabey for the CL. Conceding 2 goals in injury time, losing the match. Which could be the reason for a shitty season. Not exactly the sense of continuity everybody expected in J. Jesus's 2nd season at the club...
That is why I insist: Get behind the team, in the beginning as well as throughout the whole 90'. Make players feel your support. They deserve it all the way...