I wouldn't let Tiago walk because of it but Robinson could end up being a huge pick up. Him playing in the Spurs system, with the Spurs development staff and with Tim Duncan could be just what he needs to tap into that fifth pick overall potential.
I would give up our 28th in a heartbeat for this to go through. This draft's talent is very mediocre to begin with and the talent level really drops off in the early to mid twenties.