I don't think the name fits the effect. Why doesn't this card affect the middle row? Since this card is called "Strength in Numbers," I think it should give an attack boost based on the number of creatures you have out. Just my
just realised I forgot to answer this:
Imagine a gang/group of protesters say, those around the edges/back feel stronger due to the 'strength in numbers' kinda effect. Those in the front row (i.e. first to start marching/whatever) don't really feel the bonus as they get into contact first with opposition/whatever.
In EtG that 'front row' of creatures, are actually played into the middle of the field, those attack first etc, so they don't get the bonus, only those behind/around etc.
does that make sense?