A’ja Wilson and Allisha Gray once wore the same uniform representing South Carolina in college during the 2016-17 season. But that doesn’t mean Wilson won’t let her competitive streak shine through when the chance arises, and with a bit of humor. Wilson, as has been documented, was hunting a blocked shot on Gray during WNBA action in the past, a privilege she eventually managed during a Las Vegas Aces-Atlanta Dream game. And while Wilson got her block on the former teammate — to cash in after Gray said it wouldn’t happen — she got another go at it during the matchup between Team USA and the WN…