Without reading it anywhere, I got to believe this came down to Nico and part(s) for Monroe.
Detroit was playing Josh Smith out of position at SF (where apparently he was a disaster). Detroit would love to slide Smith to his natural PF position to play down low with Drumonds and having Batum play the SF position.
Unfortunately this scenario doesn't work out for the Blazers as the Blazers wouldn't have a quality SF, lose a glue and chemistry guy and either Lopez or Monroe would come off the bench.
I could see the Blazers trying to sell Wright being a potential SF starter and then throw in a Robinson and Cj or some package. But Detroit probably balked any idea like that as that is just a package of bench players.
Will one team cave as the summer goes on? Can we trade for a SF to trade or maybe get a 3rd team involved?
Smith, Monore and Drummonds really doesn't work well for Detroit . . .