The Lions gave up both Yeo and Sam Docherty during the 2013 trade period and have been kicking themselves since.
Yeo pips the Carlton defender following his dominant last three seasons, winning two best and fairests, two All-Australian selections and a premiership medal.
Add Yeo's two-way running into Chris Fagan's flashy midfield and they're one step closer in 2020.
MELBOURNE, AUSTRALIA - MARCH 15: Elliott Yeo of the Brisbane Lions kicks the ball during the NAB Cup AFL Grand Final match between the Carlton Blues and the Brisbane Lions at Etihad Stadium on March 15, 2013 in Melbourne, Australia. (Photo by Michael Dodge/Getty Images)