Why? I would prefer a match with all our starters rested - we have more important priorities than the cup games. I think you put too much emphasis to the opposition: it doesn’t matter that we play Liverpool, it is still merely a cup 4th round and nothing more than that.
Playing Liverpool is always more than just another match or just a 4th round FAC tie.
They are the enemy and so we should do anything and everything to beat them.