It isn't often the case that production numbers alone convey a player's dominance or lack thereof. Week 1 certainly not. The weather and QB play were huge factors. Gilmore and the D in general were great but the tape, and surrounding context, is the only way to determine just how great.
Fantastic player on a fantastic contract. The type of signing/trade that championship rosters are made of. Milk the last year of his deal for everything he has then let him sign a massive retirement package somewhere else. Take the comp pick and trade it away for the next vet on an expiring deal.