"If he liked windows it would be a plural"
It should have been window and not windows in the above post. I apologise.
"If college was intended there would not need to be a sentence about windows and footballs."
About this, consider the statements as a part of a paragraph.
"The football in the window is what makes this window different from other windows."
Exactly, what if he liked that specific window. It is very unliking but my point is what hidden rules did we use to identify that we ARE talking about the football and not the college or window (with the football in it).