Wouldn't the Rest of the Town...
… refuse to let them change the water tower to "The O'Shea Brothers"? I mean really what did Danny do to merit being up there on the same level as his brother? Ok he coached a pee-wee team to an upset victory and ran a nice small business. Kevin won a Heisman Trophy, ran a multi-million dollar car dealership, and was responsible for getting the pee-wee team set up in the first place.
Think about it this way: If you were a stranger and passing thru Urbana, and you saw the water tower said "Home to Heisman Trophy Winner Kevin O'Shea" you know immediately who that was and why his name was up there. If it said "The O'Shea Brothers" you would think "Who the hell are they?"