Lin's Father in Season 2?

We all know that Lin Beifong's mother is the esteemed Toph, but haven't we all wondered about Lin's father? 
Some have thought Lin's father, or Toph's husband, could be Haru, the Gaang met in an Earthbending town, claiming Lin looks like Haru's mother.
Others say it could be Teo, the boy in the wheelchair they met at the Northern Air Temple, as some said: "Teo could be her eyes, Toph could be his feet." 

Others say it could be The Duke. Despite Toph being four years older, fans thought it adorable when The Duke lent Toph his helmet to throw up in, in Sozin's Comet, and they were seen cheering together at Firelord Zuko's coronation. 

There is also a boy in an Avatar book: Love Potion # 8, named Ohev.

We don't know who Lin's father is yet, but we'll find out in Season 2 of Korra.

  

Who do you think is Lin's father?