Hello Bel.
The situation 2 described by you .....
___AAA
ECCC
E
E
will never happen in open terrain...
I have to move first stand of charger to center of nearest charged stand (that´s a rule)
As the edge of cvalry is 4cm long the first charging stand will be place centraly (covering 2cm) and the remaining 2 stands will be position left and right of it getting each 1cm edge contact with COK.
The explaination given for your situation 1.....
E__AAA
ECCC
E
..... I do not agree with your exlaination ..... because it would mean that if I charge with only 1 cavalry unit the COK in the edge I will never get the full bonus for an edge charge.
They are not fighting to their front....
But at least it shows that it is not clear for quite a lot of experienced players

Regards
Claus