Chelsea will be a difficult club for Arsenal to win? How and why, on what instance? Arsenal is way more than Chelsea right now and for awhile now. I want you to go through the last matches they played with each other. Arsenal has worked hard this season which also means that they have more chances in the next match.
Actually the words are also not wrong because however even though now Arsenal are much stronger than Chelsea but this will not be easy to win even though Chelsea is also difficult to win.
Chelsea's problem at the moment is just finishing but in the last few games with their 4-3-3 scheme things like this have looked much better but on the other hand in terms of possession and opportunities they are still quite good from the start of the season.
Arsenal will definitely be troubled in this case because however in terms of the game Chelsea are not too far behind, it's just that they are still bad at finishing which makes their performance disturbed.