On what basis was Lockett a better footballer than Ablett or Carey?
Certainly, Lockett could never match the athleticism of Carey or Ablett. Lockett was obviously a champion, but he was pretty one-dimensional. I reckon Carey and Ablett were both more complete footballers.
Not as athletic I agree but you're underselling Lockett's athleticism. Have a look at Lockett pre '91, he was a lean, fast athlete. In '87 (the year he won the brownlow) he played plenty of footy at CHF and in the ruck. I also saw him play in the ruck for Victoria against SA and he was of the best players on the ground. He was a stay at home FF for the bulk of his career - basically because he was the best in the business and his fitness and asthma wouldn't allow him to play anywhere else. Baldock has always said that he was a better CHF but his asthma wouldn't allow him to play there for long enough. He was not one dimensional. Anyone as skilled, quick, strong and clean on the ground as he was is not one dimensional.
Lockett kicked 7 goals or more 72 times in his career and double-figures on 22 occasions. No-one has got anywhere near those numbers. I've never seen anyone dominate games like he did with often poor delivery and little assisstance from teammates. That's why he's the best footballer I've ever seen.