They are suggesting its much more than ".000000001" off. They're saying the unit is unrealistic and unlikely from both a historic and common-sense point of view. This is generally a bad thing in a game that lifts so much from history.

What would cool is if a single knight led a group of squires and lesser mounted troops. I'm pretty sure that's how it was done, at least in parts. The Tuetonic Knights would have a full knight leading a bunch of poorer mounted soldiers in a unit called a banner, I think.