How did the "whale" have so much invested in the market but such little voting rights?
The whale has been inactive and almost certainly didn't vote on this proposal. The Solend team tried to reach out to them via socials multiple times and they never responded. You can see their attempts in the "What We've Tried" section here[1] [1] https://realms.today/dao/7sf3tcWm58vhtkJMwuw2P3T6UBX7UE5VKxP...
Three Arrows Capital?