Wait a second....NOBODY is saying that Losman cant cut it.
What is being said that if you DO put him in, be prepared for growing pains. They may come. They may not and everything might click. But by taking the risk of playing a rook with ZIPPO experience, youve got to be prepared for losing and growing pains. You MUST be prepared for that very possible scenario.
And frankly, its downright laughable to compare an untested rook to a first ballot HOFer, one of the leagues BEST passers and one of the best young QBs.