From my draft notes:
Round 7 @ 261
OT AJ Arcuri: He is a very big man who reminds me of Havenstein due to his size and positional limitations (strictly a RT). The other reason he reminds me of Havenstein is he gets beat by speed. He lacks the quickness getting out of his set and into his slide. He can be bull rushed and taken off his balance. He moves well but he doesn't always deliver in the run game. He has shown difficulty blocking on the second level, a key skill for a RT who is often the lead blocker on some runs. If they stick to zone concepts he probably will do better. A man gap scheme might be outside his skillset. All these things are the reasons he dropped and was considered by many as an UDFA project. AJ needs to spend every day in Whitworth's garage training, gaining strength and learning how to use his hands which is a glaring weakness. Foot quickness can be improved but it takes commitment and time. It's why I see his ceiling as a backup RT and not a lot more at this point. That's a lot to clean up to even be a swing OT.
I still see Jackson as replacing Havenstein next year which will give the Rams two bookends at OT.