Gridcoinstats only shows addresses that have actively staked on the network at least once. Many investors, such as the one we see here, move their coins to many small addresses and don't actively stake with them frequently. If you follow the transactions for the CPID listed you can see massive amounts of GRC moving to hundreds of smaller addresses.

Gridcoinstats is not 100% accurate about people's balances. You can't see everything someone owns by just looking at one wallet address