On a technical front, he never committed to LSU, although he de-commited when LSU offered.
What happened in that time period was a commitment by Lawrence (DT) and a real possibility of a flip of Sci Martin (DE/LB). Martin could possible play a hybrid-LB position, LSU is basically desperation mode for LBs. LSU has definitely cooled, which is why I said recently I didn't think he ends up there.
Martin is just a bigger priority, if LSU wants to make a run this year. The desperation at LB at LSU is real, if Beckwith gets hurt there really is nobody to replace him, pretty much like that at the other LB positions. I would not be surprised if Beckwith gets hurt that a true freshman walk-on isn't second team.
This could end up not working out for LSU but I can understand the logic. LB>DT, Martin>Christmas
I thought the Vols would have been a better fit for Christmas over Texas, I hope Christmas likes Herman.