The Steelers talked about using the draft to add to their quarterback depth. Instead, Pittsburgh signed John Rhys Plumlee as an undrafted free agent. Plumlee, the former Central Florida and Ole Miss star, shared on X his good career news. He wrote “Extremely fired up to be part of Steeler Nation. Here we go.” The “here we go” comment seems to be a nod to new Steelers quarterback Russell Wilson. The Steelers have totally redone the quarterback depth chart. They signed Wilson, then traded with the Bears for Justin Fields. Plus, the team signed veteran Kyle Allen as a free agent. Meanwhile, no qu…