O_P_T
Why Be Normal
So you're saying five guys can build chemistry with each other, but six guys or seven guys cannot.
What makes the number five so special?
And what about the tight ends - sometimes they have to block. Is their chemistry with the other members of the offensive line not important?
Well I'd think that there are normally 5 OL on the field for every play is a major factor in choosing that number.
If you only have five on the field at a time, then the other one or two guy(s) on the sideline can't possibly gain any chemistry on those plays.