If this would happen, and the Rams traded the No. 1 overall pick to Pittsburgh in return for Roethlisberger, the Steelers would likely go one of two ways.
1.) The Steelers would draft Russell Okung, OT, Oklahoma State.
The thought process behind the Okung pick is simple. The Steelers are in desperate need of a franchise tackle, Suh doesn't fit into their 3-4 defensive scheme, and the team believes Dennis Dixon could get the job done at quarterback.
Dixon knows the team and offense, appears to be progressing nicely, and adds the element of the run from the quarterback position. With Dixon at the helm, Pittsburgh would get back to "Steeler Football," running the ball.
The team would make Mendenhall the feature in the offense, and veteran Charlie Batch and new tackle Russell Okung would help ease Dixon into
the starting job.
The Okung pick would certainly have an effect on the rest of the draft. Sam Bradford would fall to either Seattle at No. 5 or Cleveland at No. 7. As these are two of the teams vying for Jimmy Clausen, there is a chance he could fall to Minnesota at No. 30.
There would also be a ripple effect with the offensive lineman. With Okung gone, Washington would have to settle for Brian Bulaga. As a result, Trent Williams could move into the top 10 and go to Oakland at No. 8.
At pick No. 18, the Steelers would no longer be interested in OG, Mike Iupati, and would draft the best available defensive back. This would be either Kyle Wilson or Earl Thomas.
2.) The Steelers draft Sam Bradford, QB, Oklahoma.
Pittsburgh would make Bradford the franchise, and in doing so, hope that he never drags the team's good name through the mud. Veteran wideouts Hines Ward and Antwan Randle El would help Bradford with his transition to the pros.
The rest of the draft would play out as planned.