From the look of things Chelsea is already a threat to so many teams, just look at how they performed in the club world cup, the chemistry between the team is something else. Last season in the first half of the season, the team solely depended on mainly one player which is Palmer. But from their strategy and way of playing, they don't depend on just one man anymore, they play more as a unit and look for spaces to exploit from various angles and from different players.
I don’t think Chelsea are a big threat despite their squad numbers, I have a weird belief that not all the players Chelsea have signed this summer will remain fit and in consistent form throughout the season. Already they have lost Cole palmer and Delap to injuries which leaves them unbalanced in attack and more injuries will come.