"Along the way, MetroPCS considered deals to buy more wireless airwaves from other companies. In March 2011, MetroPCS met with senior executives from “Company D” about acquiring spectrum or possibly all of the business. That party was Clearwire Corp., a person familiar with the matter said."
They made an offer and was placed on hold due to the pending deal with SB who wants everything or else. Sprint wasn't going to approve spectrum sale with a bigger event looming over both sprint and CLWR that was all or nothing. So now SB has the green light to hoard all this spectrum for better days.