Chris Grant*Last time by position a non-midfielder has won the Brownlow
Ruck: Adam Goodes 2006* (if you count him as a ruck as he was more a midfielder, otherwise Scott Wynd in 1992)
Full-Forward: Tony Lockett 1987
Rebounding Defender: Gavin Wanganeen 1993
Centre-Half Back: Ross Glendinning 1983
Not sure a Fulll-back has ever won the award? I stand to be corrected on that