Facing Newcastle seems like a crucial moment for Chelsea to prove if they've truly comeback their status as a strong eam and consistent team, or if they still a team with unstable performance. The real test might come on November 25.
Newcastle is currently in the 7th position, showing a bit of inconsistency. Despite defeating MU and Arsenal, they unexpectedly lost to Bournemouth, a team considered an underdog. The interesting point here is that both Chelsea and Newcastle need to demonstrate that the winning team gains extra motivation to reach their best performance.
imo , chelsea hasn't reached its peak performance yet. I believe Pochettino is still figuring out the best combination for the team, and it might require a few more players to establish a strong second layer team with solid performance.