David Fofana has already been done by Chelsea already as it was confirmed by Famous Italian Journalist Fabrizio Romano. Armando Injured is far better than Aubameyang currently who has been the worst player for Chelsea if I should suggest.
Jamie Vardy who hasn't scored a single Premier League is far better than the so called Per Emerick Aubameyang who has scored once or twice for Chelsea this season.
I do not see them jumping into the top four spot they need improve with the players they currently have, I'll like to see Chelsea complete the signature of Declan Rice no issues with that as he will be a better suitor for that Ngolo Kante's position which haven't been well used since he got Injured. Chelsea needs a good defensive midfielder and Rice can fill that role up very well.