I think/hope Quinnen Williams can challenge for the top spot which would be great for us. I don't think the 49ers would take a DL, but there is a chance that Arizona does. Not saying it is likely, but he is very impressive.
He might be on our board depending on what defensive scheme we end up with.
I don't see nearly enough pieces in place to make me think transitioning to a 4-3 would be substantially more difficult than sticking with the 3-4. There's the President, maaaaybe Leonard WIlliams, and then everyone else is either a JAG, a UFA, or a GTFO.