First, the selection process favors those who have less proposals than other proposals. Since there were folks that had zero successful proposals, anyone who had a successful proposal was eliminated.

Second, the selection process favors those who have the most effective voting power. Since all players currently have max power, nobody was eliminated at this point and multiple proposals remained.

Third, the selection process favors players that have been in the game the longest. Thus, the oldest player from the remaining proposals ended up winning.

Note that this process can be changed in the future at any time via a proposed rule change.