BloodRaven
Pro Bowler
The comparison I'd make is like the movie Titanic, where (spoiler alert) the boat hits the iceberg and you hear that loud scrape as the hull cracks open and the engineer says things will be fine as long as five of the nine compartments stay intact. I don't think I'd encounter much disagreement if I said that at least five of our offensive compartments have been filled with water - and Marty's one of them. Whether or not he's the most important compartment is difficult to say, but if we're keeping one compartment around we'd best make sure we're improving four others.
By that analogy we still sink with an undamaged compartment. We have an (surprisingly) efficient ground game and a balanced run/pass ratio, but he cant make Flacco or our recievers play better and neither would another scrapheap OC.