I do agree with this.
Rojo + Jones was our best defensive partnership so far and I don't think they ever let in 2 goals. Together, they kept many clean sheets, too.
The problem is that Jones is mostly injured, so we can't expect to operate that partnership.
IMO, we need to have Rojo as the CB, with either Smalling or Baily partnering him. Rojo should not be LB - that should go to Blind.
If Jones is fit, the Rojo + Jones as the CB, would probably ensure that CFC do not score against us.
Against CFC, I would certainly not play with Smalling, because in the last CFC game, Smalling was our worst defender and by the end of the game was a nervous wreck. As a manager, it would be irresponsible to send Smalling back up against the same CFC attack which terrorised Smalling. If he does play (agaiinst CFC) and messes up again, he may need to see psychiatrist!