I think this is a stupid strategy that is only going to bite them in the ###. How would "offers eventually come"?
If NYG and DET took QBs, then Miami is ON THE CLOCK. They could reach for a different QB or trade back, or take some Oline player (one maybe the Giants didn't want) and that screws everything up for both teams. Also they likely will have made their other first round picks too, so any trade DET or NYG got, would likely involve FUTURE picks rather than getting more picks in this draft. Would be dumb on all fronts.