The where’s R.O.D.R.160 collection is the only set in the airdrop with a 1/1 piece. As of writing this its held by a collector who managed to collect one of every other piece as well (probably about 100 different NFTs). 

Obviously because of this 1/1, there can only ever be one person holding one of all the pieces in the cNFTcon 2021 airdrop.