Sano should try to play 3rd, but I would say elite third basemen really aren't rare anymore. In fact, I'd say elite first basemen are rarer. Right now, there is a big talent wave at the hot corner. Miguel Cabrera, Manny Machado, Josh Donaldson, Adrian Beltre, David Wright, and Evan Longoria are all at an elite level. Then there's a good group below them with Seager, Uribe, Arenado, Headley, Prado, Lawrie, Alvarez, and Zimmerman. That's 15/30 starters playing at a high level at 3rd base with 6 of them being elite. At first base, I'd only say Votto, Goldschmitt, and Davis are playing elite. That's 6 to 3 favoring 3rd. There's a quite a few good first basemen below them though. Swisher, Napoli, Craig, Trumbo, Freeman, Encarnacion, Belt, and Gonzalez add 8 more for 11/30. There's quite a few more great athletes playing 3rd base in the minors too and I think the trend will continue for some time. I wouldn't be surprised if we see some more Kris Bryant types being drafted high. What's most interesting to look at is that every elite third baseman is on a contender (except David Wright).