I think he will. One of the alignments Zimmer is known for is the Double A-gap blitz, where he either brings one linebacker or two up the middle, often paired with a safety or corner coming. One of the reason I think we'll play Parsons at linebacker on early downs is to bring him up to crash the gap and mess up the blocking. If Zimmer is smart about it, though, he won't just bring him into the A gap, but bounce him all along the line on those early downs. Run blitzes can be just as effective as pass blitzes ... but often what Zimmer (and other coaches) will do is not actually blitz by dropping a lineman when a linebacker blitzes. Confuses the blocking. Parsons rushing won't confuse the blocking because everyone is going to be expecting that. Where he rushes from will be the chess match.