Really? Because you'd be wrong.
I'm not going to pretend that they haven't had a talent advantage over most of our RBs for the last several years, but in the last 5 drafts LSU had 3 RBs get picked up in the 1st, 2nd, and 3rd rounds. The draft before that it was Fournette at 4th overall. In fact, in the last 20 years LSU has had at least one RB drafted in the first 3 rounds every 3 years or better like clockwork.
LSU: 8 draft picks in the first 3 rounds this century, 3 being 1st rounders, and 15 total players drafted.
In the last 5 years we've had 2 RBs get picked up: Kyren in the 5th, and Juice in the 6th. Kelly only had two other RBs get drafted at all in his 12 seasons: Procise in the 3rd, and Theo in the 6th. Weis never had a RB drafted, Walker went undrafted. In the 21st century Notre Dame has only had 5 RBs drafted total, the last one was the highest and it was Julius Jones in the 2nd round....20 years ago.
ND: 2 draft picks in the first 3 rounds in the last 23 years and none that are 1st rounders. Only 5 players total drafted.
We simply aren't known for producing NFL level RBs anymore. Theo exceeded expectations in Detroit, and the jury is out on Kyren, but the other recent draftees haven't amounted to anything really. Maybe Estime could change that perception, but right now Diggs stands to gain attention by moving to LSU, especially if he ends up getting more carries than he'd have if he stayed at ND. It was the smart move to improve his draft stock.