I am pretty sure
@Dizzy clarified that there is no unblocking frame. The reason you need a 6 frame move to punish a -7 move is because NRS startup frames do not include the first active frame (it is done in an older style and 6 frame startup means it hits on frame 7). It’s just that
reversal specials and throws have one less startup frame. As such, if Baraka is neutral on block, his seven frame d3 will not beat a seven frame reversal d3 from the defender. It will trade.