Does anyone know why CA made Chivalric Sergeants have less morale and attacking penality compared to Feudals or Gothics?

I've been perusing the the unit_prod excel spreadsheets provided by CA in the past and they have the CS classed as Missile troop type (hence why it gets a negative attack stat and less morale). There is a comment in the spreadsheet from 'Bob Smith' that they were lessened to make the transition to Gothic Sergeants more smoother.

If you look at the Feudal and Gothic Sergeant troop class setting, they are both set to NORMAL. Feudals are also classed as being unarmoured, where as Chivalric's are classed as having mail armour. It just seems strange that the Chivs would have their morale penalised for wearing armour, I would think their morale would be equal to Feudals as they'd be more confident due to actually wearing armour now.

I guess it is easy for me to modify the Chivs so they are classed as NORMAL troops, I was just curious to know why Chivs got penalised as such and if anyone have any inside knowledge of the design decision.