Chelsea have been bloody awful to watch this season IMO, a proper one man team that without Hazard would have struggled IMO. How much of that is on Sarri is very much up for debate though tbf as Chelsea seems to be rotten to the core in regards of top level management. If Hazard leaves this summer, and the transfer ban stays, I can't see how they finish anywhere near the top 4, let alone being in a title race, no matter who manages them.