#2 Kenedy

The Chelsea defense last season blew hot and cold, to say the least. On one side, Maurizio Sarri's men kept out the ever-so-dangerous Manchester City at the Bridge, while on the other, Watford were made to run over the back line with license.
One player who received major slack was Marcos Alonso, who was often found ball-watching and floundering in the advanced areas of the pitch. It left the center backs completely exposed.
Emerson was a 'safer' option as they say, but he too wasn't the most daunting while delivering his crosses. Meanwhile, Kenedy is a more gifted player. He possesses finesse, the best of touches and a spark about himself.
With him having returned from his loan spell at Newcastle, we can expect the management to give him a go, in order to add some dynamism at the back.