Probably because they wanted to get stronger in heats 2,8,12,&14?
As much as I want Cook as part of a strong top 4, I would not have let go of Zischke or Vuolas, so could've ended up with a team like:
Troy Batchelor 8.46
Craig Cook 8.42
Tate Zischke 6.96
Annti Vuolas 6.40
Vinnie Foord 3.90
Jack Smith 3.64
Sam McGurk 2.00
Total 39.78
So would Cook / Smith / McGurk score more than Bowes / Etheridge / Hook?
I definitely wouldn't want a team with Foord starting in the top 5, I would not drop Zischke or Vuolas under any circumstances, so to create the strongest Workington team, it means either Cook or Batchelor had to go!