This can be smoothed over with writing. Maybe he was banned from Tulla or failed to solve their puzzle or whatever.
But there is already someone who's banned from Tulla, a guy who's a reference to Fallout 1's Vault Dweller because he was completely out-of-touch with magic and exposed too much to technology for a long time.
The vast majority of Arcanum followers don't have any dialogue or story attached to them outside of recruiting. Virgil and romances like Raven are exceptions.
Aside from the aforementioned Jormund, Virgil, and Raven;
- Sogg Mead Mug, okay not much story or dialogue whatsoever, but you can always ask him for the tavern/inn in towns
- Jayna Stiles, haven't tried recruiting this one but from what I see she's a healer for tech-character*
- Magnus, LOTS of dialogue and story, with an overarching quest related to him that's not immediately obvious
- Gar, you need to pass Persuasion check and then hear his story about being born a human that looked like an orc*
- Dog (Worthless Mutt), somewhat obviously a reference to Dogmeat but instead of preventing someone from entering their own house, this time the dog is being kicked to death by a gnome
- Geoffrey Tarellond-Ashe, a necromancer whom you can help with getting an item that caused the dead to rise in Ashbury's Cemetery. Won't join unless you're evil.*
- Dante, former servant to the King of Dernholm. You can mention that you're doing a task for the king and he will help you, then after you're done you can convince the king to accept him back to his service*
- Vollinger, a member of Molochean Hand whose motive can be said that he's either curious what's so important about you being the sole survivor of blimp crash or is looking for the right time to kill you, unless you convince MH's leader to stop pursuing you*
- Chukka, personal bodyguard of Gilbert Bates who told you his story of nearly getting assassinated and was saved by the half-ogre*
- Waromon, a Bedokaan who will not join you unless you resolve the conflict regarding poachers through deep conversation with Bedokaan's chief. In this case, the chief spoke for Waromon, and obviously Waromon will not join you unless the chief REALLY trust you.*
- Torian Kel, an Undead who ask you to retrieve dragon's blood so he can regain his body, and then went on to tell you his story.*
- Perriman Smythe, a mage of Tulla who's (iirc) on a quest to gather information of outside world, first encountered after he finished a business with Willoughsby.*
- Z'an Al'urin, a Dark Elf who's question her kin's motive, and will join you if you're being honest with her*
- Sebastian, a guy tasked with Willoughsby with cleansing the Boil.*
- Tollo Underhill, a halfling prisoner of Dernholm's Pit.*
- Weldo Rubin, a halfling adventurer who you can find at the Gate to the (Vendigroth) Waste.*
- Loghaire Thunder-Stone, King of the Dwarves. If you ask his son about the Shape and Stone, you can have deep conversation to convince him to return to his throne. After he joins you, he can have conversations with Magnus once you solve the quest about Iron Clan
- Franklin Payne, iirc a monster-hunter of some sort because the sheriff of Caladon mentioned that about him when you're doing quest to solve murder in the city. Will join if you mention to him that you're going to Thanatos*
- And finally the four beings who were banished to the Void aside from Kerghan. ALL of them have story and dialogue, of which I even laughed because they actually doesn't seem so bad.**
*This companion I haven't recruited but I've done quests enough to know about them or read up on them on the wikia.
**I only recruited Arronax
So, looking at the list, from my experience only #1, #2, #5, #9, #10, #14, #15, #16, and #18 doesn't have much story and dialogue to them because I only recruited #1 and #5, while the rest because I haven't recruited them BUT I encountered them and know enough about them, with only #15 and #18 that I haven't really encountered. And all of this, before taking into consideration the fact that you can ask each individual companion some questions on either what you should be doing or what do they know of a place when you're there.