Kareem Walker Switching Uniform Numbers?

The Michigan Football Twitter account shared several photos of the team huddling around Cesar Ruiz as he lifts some weights. If you look at the picture on the top left, Kareem Walker, in the second row behind some teammates, is wearing the No. 46:

"When we need one yard, who can we count on?"#GoBlue 〽️💪 pic.twitter.com/ZPpi3Ejsev

— Michigan Football (@UMichFootball) March 13, 2018

Walker, who saw action last year as a redshirt freshman, started off wearing No. 6.