CBS has to leave 1:00 games by 4:15 - at least when they don't have a second game - except in the local market for the game. League rules, to protect the other games at 4:15.
The reason ST did not leave it is that it doesn't abide by the same rules because it lets you have the option to watch all games just as if you are in the local market. Not sure why they would cover another game, though - seems like they could move something to another channel or something - there aren't that many 4:15 games.
The Stelers game in HD was not available till after the Browns game was over, your right,this should NEVER happen with all the channels available for ST.
The Steelers on the SD channel WAS available.
Jimbo