Not sure where you come to that conclusion. More than 50% of regular nodes are signalling support for segwit which is already a majority of sorts, far more than are signalling support for BU, and there are 5x as many miners signalling support for segwit than BU. Neither has the majority required to create the dominant chain since they both fall far short of their mining node requirements for activation, but on those numbers there is no sign whatsoever that BU is "exceeding support for SegWit" and "winning" as you claim. The only thing BU seems to be exceeding support for is the number of new posts on btctalk, though most of them are coming from the same forum members (EDIT: Most of whom I've set to ignore since they don't use sane arguments and are mostly trolls).