At least there is the opportunity that Lewis could still get better.
And with a number of young corners on the roster who the Steelers don’t want to give up on, it may not make sense to keep McFadden and his higher salary hit and take the chance on somebody signing Crezdon Butler or Cortez Allen if they are released.
That’s logical. The idea of getting rid of McFadden entirely scares me a bit, given that the Steelers don’t really have any proven options after him and Ike Taylor. But McFadden definitely isn’t any great shakes and isn’t getting any younger, and Lewis had a nice performance in the Steelers’ last preseason game against the Eagles. If the Steelers think he’s their best option, they’re probably right.