Rashard Mendenhall and Willie Parker?

Steelers take Rashard Mendenhall in 1ST round (RB).If your a Willie Parker fan your shocked. Why a RB, weve got Parker?Mendenhall is suppose to be the 2ND best RB in the draft.Now we have the good sides of this pick and the bad side.THE GOOD: they can split carries and become a 1,2 punch.one question though what about Davenport,Russell and Melwede Moore.Now the Bad:You can only work a offense if you have a good offence line.We had the most last year, and we lost Alan Faneca.Will Mendenhall one year replace Parker and get him cut or as a backup.Look Whats Happen in the Past two Years.Adrian Peterson comes along and replaces Chester Taylor who had i think about 1200 yards, and Maurice Drew Jones and Fred Taylor situation.But then look at what happen with LT and Michael Turner,they were a nice one,two punch.But now Turner with the Falcons.The really bad part:Parker's contract expires in 2010. Maybe A good 2 seasons.I want Willie to stay and also Mendenhall to make a good one,two punch.