Well Frank destroying Frank is my season 5.
Season 4 would see Claire stepping out of Frank's shadow and learning from her previous naivety
My season 4 was to get the ball rolling with Clare's death and blaming it on Frank affecting him in such a way....
And we would watch him unravel on a downward spiral for season 5 with the things he thought were secret coming out.
The end of series would be Frank being killed by Lucus (for Zoe) after finally being released from prison after several years.