ImgTec isn't an Apple subsidiary. Pre-existing Corporations purchased by AppleAlgoTrim, C3 Tech, Polar Rose, Anobit and PrimeSense. None of these were deliberate creations of Apple and thus invested capital to build global R&D Centers. They are purchased companies whose R&D locations act as satellite divisions, all coordinating with the main IP at Apple. Most of those staffs either leave after the merger or relocate to Cupertino, while small hands on staffs stay remote.