The goal of this paper is to provide a novel analysis of T-to-C movement based on the labeling theory in Chomsky (2015) (POP+ hereafter). To do so, we discuss the asymmetry between the matrix and embedded questions with copular phrase ellipsis. In the former, where the T-to-C movement occurs, extraction of the object wh-phrase out of the ellipsis site is permitted. However, in the latter, which lacks T-to-C movement, object wh-phrase extraction out of the ellipsis site is not allowed. We propose that such a contrast results from the interplay between de-phasing (POP+) caused by T-to-C movement and a version of ellipsis, whereby XP ellipsis occurs when its licensor is introduced into the derivation. Especially, by showing that both T-to-C and V-to-v movements induce de-phasing, we point out that these two types of head movement can be uniformly attributable to the "affixal status" of phase heads (i.e., C and v). We also discuss whether v-to-Voice movement induces the same effects, under the assumption that the highest projection of the verbal domain is VoiceP, by using Korean and Farsi light verb stranding ellipsis.