[Eddie.]

Assuming each season had the same F3s:

BB2:
Will wins.
Monica is close behind because of sympathy votes after 9/11.
Nicole finishes in third.

BB3:
Jason wins.
Danielle, another close vote...
Lisa finishes in third.

BB4:
Alison wins.
Robert comes in second, another close vote...
Jun finishes in third.

BB5:
Drew would win by a landslide because of the teenage girl vote primarily.
Diane finishes in second.
Cowboy finishes in third.

BB6:
Janelle would win, with probably the largest winning percentage in BBUS history.
Ivette finishes in second.
Maggie finishes in third.

BB7:
Janelle wins again, for the second year in a row...
Boogie finishes in second, after the closest vote between a winner and Runner-up in BBUS history, because some people may be resistant to Janelle being a two-time winner...
Erika finishes in third.

BB8:
Same order as the actual thing. First case of producer rigging, with Dick in favour of winning. Dick would have a significant margin over Daniele and Zach.

BB9:
Ryan wins by a landslide.
Adam finishes in second because some of the comments he made in the house were controversial...
Sheila finishes in third because she didn’t have a proper strategy to begin with...

BB10:
Dan wins.
Jerry comes in a close second because he was quite popular wth the viewing public, he was runner-up to Keesha for AFP.
Memphis finishes in third.

BB11:
Jordan wins and gets more than half of the votes to win.
Kevin finishes in second.
Natalie finishes in third.

BB12:
Enzo wins by a significant margin, due to his personality and the entertainment value he brought to the season...
Hayden finishes in second, teenage girl vote.
Lane finishes in third.

BB13:
Same order, another case of producer rigging, in favour of Rachel. With or without rigging she would have won anyway...

BB14:
Dan wins again, the second winner to have won two times since Janelle.
Ian finishes in second with a very close vote, similar mindset to BB7...
Danielle finishes in third.

BB15:
Andy wins by a huge margin, he was the only one deserving of the win.
Spencer finishes in second.
GinaMarie would finish in third, with probably the lowest percentage to win for a third placer in BBUS, due to her racist comments.

BB16:
Cody wins.
Derrick finishes in second.
Victoria finishes in third.
Votes per houseguest would probably be around the same percentage each.

BB17:
Vanessa wins by a landslide.
Steve finishes in second.
Liz finishes in third.
Steve and Liz would probably get roughly around the same votes to win.

BB18:
Paul wins.
James finishes in second.
Nicole finishes in third.
All three would get rougly the same percentages to win.

BB19:
Paul wins, third two-time winner, second to do it back-to-back, wins because of producer rigging.
Josh finishes in second.
Christmas finishes in third. (She had no chance anyway...)

Didn’t include OTT because the winner was decided by the public vote...