[Washington]

Perhaps Carlos signed with a view to review the position of the Club at the end of that year. Promotion certainly puts CC in a position to improve his terms with two playoff finals, one being successful.
Flip side of that coin is two unsuccessful playoff finals and you'd be looking to make a change and perhaps let Carlos leave. Pushing on with the foundation he has laid.

Or as being touted elsewhere he's a bit homesick or should we fail he is too mentally drained to mount a third challenge. I guess time will tell but it always seems to me his relationship with DC is good and normally news out of S6 is very tight and especially for something of this importance.