In football we cannot just do without records and history, if Chelsea was unable to win at home against two average or weak teams, is it against Arsenal that they will win? Borovichok you said about Chelsea player blunders and coach formation mistakes as the reason why Chelsea lost those two matches. The real question should now be if Chelsea have now learnt how not to make those blunders that leads to their losses?
Talking about Pochetino, I think he is the only coach of Chelsea in the recent time that had the opportunity to take Chelsea on a preseason tour. The case of Gramham Potter and Lampard, they were not opportune to take the team on preseason so they may claim that they are not used to the boys and not Pochetino.
This is football, the impossible likely happen, ofcourse I've seen surprising results over time and Chelsea versus Arsenal match, I strongly believe the Blues will have their way against Gunners. Remember Chelsea shared points with Liverpool in the first opening EPL game this season, my big question is directed to you, don't underestimate the Blues simply because we made few decline in previous games and dropped points against average teams. The fact is out, Chelsea is competitive this season, perhaps it's not easy for the a new coach, Mauricio Pochettino to meet the high demands of the blues but he will try his best to fit in.
I was a bit confused while reading through your comment, but i came to a line and i understood why you seem to have strong believe that Chelsea will have their way against Arsenal, needless say that you are a Chelsea fan, that very nice and ultimately encouraging.
For sometimes, it's pretty hard to stand firm in supporting a club that seems to be heading nowhere, now, don't get me wrong, i am not saying that Chelsea is heading where, that comment is on a general level, since i also believe that no team should be under-estimated no matter how small they are, or untalented the players in that club seems to be, in football, anything can happen and anything is possible.
But coming back to your opinion concerning the Chelsea verse Arsenal match that is coming up, and also coming back to reality, Chelsea is not having any way against Arsenal, at least, not now, and not in this season. If anything i am expecting, it's that the coming game between these two clubs will be an easy win for Arsenal, but no conclusion though, this is just my own personal prediction based on the current performance of both team in this season's EPL.