I am a Chelsea fan, Chelsea in the last 4 matches played quite well, they have not been defeated, they only drew with Arsenal,
In the last 5 matches in EPL, Chelsea won 2 matches, 2 draws, and 1 loss. I don't think the stats is good enough. But I can appreciate that Chelsea could draw against Arsenal. It looks like Chelsea defense improving a bit.
tomorrow Chelsea will be Brentford and Chelsea are the hosts, I am sure if Brentford uses a 4-3-3 formation then Pochettino will too using the same formation (4-3-3),
4-3-3 is the common formation used by EPL teams. It is because the teams in EPL mostly use wingers. Brentford wingers are quite good, Chelsea defenders must be careful with them. Pochettino must stop Brentford wingers if they want to get a bigger chance to win.
in the league cup, chelsea will face blackburn, I am sure the match will not be difficult for the chelsea squad.
League Cup isn't the same as EPL. We often saw many surprises in league cup. So, Chelsea mustn't underestimate blackburn.