For this exercise, I'll refer to mini draft pick 1 as 'Jack Martin'.
GWS were going to lose Dom Tyson and 'Jack Martin' but gain Pick 5 and 6
Dogs were going to lose picks 5 and 6 but gain Jack Martin and Pick 9
Tigers were going to lose Pick 9 but gain Dom Tyson
Obviously that was the 'basis' of the deal, we were going to have to give a little more down the order and the Dogs as well, so GWS would have received maybe a 2nd rounder and exchange of other picks.
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Deal that went through was GWS got pick 2 from GC for Jack Martin. I think they exchanged compo picks as well, not sure what round etc.