If 70% of the top 10 is still the same teams (they aren't, but we'll pretend anyway), but 50% of the top 25 is different, that says that the "experts" are decent at picking the teams that are obviously the best, and pretty garbage at the rest of it. Now as I said, 70% of the top 10 is not the same, only 50% is, but maybe you meant is still in the top 25. That doesn't make the "experts" experts - my grandma could have picked UGA, Bama, Ohio State, Oklahoma, TAMU, and ND to be top 25 teams too, and she doesn't watch football.
60% of the top 25 is the same, not 50%.
70% is the the same.
Get NCAA college football rankings from the College Football Playoff committee, Associated Press and USA Today Coaches Poll.