I didn't want to look at every back in the league, either, but doing the top 10 didn't take long.
Here are the top 10 RBs from 2021 based on yards gained:
... and here are their height and weight from nfl.com
Jonathan Taylor 5'10", 226
Nick Chubb 5'11", 227
Joe Mixon 6'1", 220
Najee Harris 6'1", 232
Dalvin Cook 5'10", 210
Antonio Gibson 6'2", 220
Ezekiel Elliott 6'0", 226
Elijah Mitchell 5'10", 200
Derrick Henry 6'3", 247
Damien Harris 5'11", 213
Here are the measurements for the Rams' RBs, also from nfl.com
Henderson 5'8", 208 (shorter than all 10, lighter than 9 of them)
Akers 5'10, 217 (would be tied for the shortest, lighter than 7 of them)
Williams 5'9", 195 (shorter and lighter than all 10 guys)
Funk 5'10", 205 (would be tied for the shortest, lighter than 9 of them)
Rivers 5'9", 195 (shorter and lighter than all 10 guys)
AlbaNY_Ram