I was considering (my) values of the players in my assessment, and for me it was not worth taking on Risto. I see the two moves as linked and they got Risto in exchange for Ghost, a 2nd, a 7th, a 1st, another 2nd (in a loaded draft), and Hagg. When the market is established and doesn't make sense, i think its better not to make the move.
I liked the Ellis trade and I think he did the best he could in the giroux trade because his hands were tied to deal with Florida.