If the end goal was to get a first for Granlund, I am not worrying about whether we could have squeezed a bit more value out of the deal. We got the first. There's no way you can convince Colorado that Granlund is worth what Nelson is worth, even if Granlund has better numbers, so I don't think we were getting Ritchie from them or anything.
Personally, and this is just me, I don't think GMs valued Granlund as much as they should and took into account his poor play last time he was traded and the market was cooler on him than other centers like Laughton, Nelson etc. For better or for worse, and Grier very likely knew this as well.
Get the first and get out.