Yeah I thought so that Forest gonna have the first break and they did... Nice goal from Elanga there.. Chelsea are having good stats in the match but you gotta see that pressure is on Chelsea now. The odds or stats means nothing here. What if Nottingham goes on to score another goal? It's a risky one right now to back Chelsea or even draw. Nottingham are really making it hard for Chelsea right now.
Really embarrassing for Chelsea. 
Nottingham Forest was able to defend well after they managed one goal from Elanga, Chelsea's attack didn't really mean that their chances were many but they couldn't find a gap in Nottingham's defense. I see Chelsea's style of play is still chaotic and the players are not very creative.
It's hard to imagine if they met Man City, Liverpool or another big team they wouldn't be so consistent, sometimes this match was bad but the next match was good.
Chelsea still hasn't found the right solution.
From October 21st, till December 6th, Chelsea's lineup of matches is against big clubs.
Chelsea have to find their feet and win their upcoming matches to get more points before then. If not, they will lose out on their ambition of moving to the top table of the premier league this season. That will be terrible after spending 1 billion euros on signing new players.