FWIW's the Rams have no Offensive Tackles on the practice squad, they currently only have three on the active roster in Whitworth, Williams & Donnal, with Saffold also having the ability to play tackle albeit for only about one quarter.
Here's my 2 cents ....
#1-Andrew Whitworth> LT over 168 NFL gms @ LT
#2-Rodger Saffold> LT/RT/LG/RG
started 42 gms in the NFL @ OT.
#3-Rob Havenstein> RT/RG started 28 gms @ RT.
#4-Andrew Donnal> RT/RG has played in 21 gms as a reserve & started or finished 4 gms @ both OT posts with 4 of the same @ OG.
#5-Darrell Williams> LT played in 5 gms as a reserve swing OT.
I would have to guess den that the release of Micheal Dunn OT from the PS has something to do with the signing of
J.J. Dielman who did have 3 yrs starting experience at RT @ right tackle @ Utah Pac 12. I just happen to like the way RT Dunn improved in pre season .