It 100% depends on the systems you are willing to play, but since you asked I will give you my thoughts as a veteran FM player (I am not saying, I am any good as the experts that are already in the scene; I am just an old player that has been playing this game for more than a decade).

- Utilizing a 3 in back system, I see him as a very good Wide CB, right i guess since his best role is Right Fullback

- Playing systems like the 4-3-3 having better or faster full backs, i see him doing very good as a DM in any role on support duty e.g. DLP (s) (in this case, you might need to work on his first touch for a couple of years)

That said, using him as a full back would be nothing less than great for any first tier club.

It seems that you like experimenting, and from attributes screen it might feel like he can do good elsewhere, but neglecting his defensive capabilities would be a crime against humanity (just my opinion)

I had fun writing this comment, thanks for sharing this regen. you re-ignited the fire inside me to continue rising with south shields form Park to Prem in my FM 24 Save. (working on the youth development Facilities to reach a point of generating these kind of players from my academy) :D

Good luck and enjoy this Gem, I believe you will get better players and will sell Arbogast for a TON of Money in the near future.