If we get 21 and 22 for 14 (from GWS), the offer is 22.
If we get 20 and 27 for 14 (from GC), the offer is 27.
If we get 18 and 25 for 14 (from Saints) the offer is 25.
In all those scenarios we've ensured we have a pick above the Crows, so the "let him go to the draft" option works for us (yeah we'll have to pay slight overs of 18/20/21, but we will still have the latter 22/25/27 pick anyway).
We'll be back in the power position, and we give Brisbane the choice of a mid 20s pick (consensus worth of Polec) or nothing. IMO if we end up without a pick before Adelaide post trade week, we've played it badly.
The other option is that Brisbane somehow get a hold of an 18-22 pick through the Longer/Yeo trade, and in that case we could do 14 for Polec and that pick. Brisbane may prefer this option because it nets them another 1st rounder, but the onus is on them to get the appropriate pick (I think late 20s wouldn't be enough for us- again, the Crows 23 pick is the arbitary/symbolic guideline).