I had 4 guest passes in my DL wallet from 2 Reserves (one personal one corporate). I canceled both of the cards and got to keep the 2 guest passes and 2 companion certs. Once they are in your wallet they are yours to keep. Amex/DL doesn’t claw them back. I just showed my physical purple Reserve card and played dumb and said there must be a mistake and she let us all in. As I was leaving I asked a different agent and he said I could still use a guest pass for me if I canceled my Reserve. Or he said if you get any pushback just walk in with anyone who has access and use a guest pass for me. Same result. This was at DTW. YMMV.