An inadequate supply of parts is partly to blame for widespread shortages of Droid Incredible, Verizon Wireless CEO Lowell McAdam said on Friday. Having been unable to stockpile enough key components such as the WVGA capacitive display assemblies manufactured by Samsung, entire shipments of the HTC-made Android smartphone are selling out within hours of their arrival at retail stores. According to McAdam, the shortage is so dire that his company “had to pull way back” on deliveries in order to focus on online sales. Had there not been such a dearth of handsets available, McAdam said the Incredible would have outsold its predecessor, the Motorola DROID; some 100,000 units of the Incredible were sold during the first two days of sale. As of this morning, Verizon’s website claims that orders for the Incredible will be fulfilled by June 3rd.