At this point I think we really need a flashback of Thjazi and Bolaire (and ideally Thimble) for a cold open. Like we need to see how Brennan plays Thjazi around Bolaire to either understand where this animosity is coming from or see where the disconnect is.
The thing is, I don't think that will help, because the issue is not "Bolaire really hates Thjazi," which is a completely valid conclusion for Bolaire to make. It's "Taliesin consistently in Cooldown and Tale Gate seems to hate Thjazi, but also, if he genuinely believes this, that casts some of his actions as Bolaire into question." Or in other words, it's a case where, while it's not impossible - I do not have insight into every potential plot developments - I am having trouble coming up with a scenario in which this perception of Thjazi can ever make sense and be a good story. Like, if he genuinely believes Thjazi would not hesitate to kill half the PCs for a higher cause (which...based on what we've seen I am fairly confident Thjazi would actively try to prevent harm to over half the PCs, so I don't think this is correct), that sort of raises the question of like. why did you deliver the paints.
I'm going to provide a couple cases of comparisons that might be illustrative.
The first is that the concept of "Thjazi is ruthlessly machiavellian to the point that he'd kill allies for the cause" feels to me like the whole "the prime deities are evil and deserve to die" claim in Campaign 3. I simply do not think there is a way, given the information I obtained through watching Campaigns 1 and 2, to make this argument that doesn't boil down to "I, personally, don't like them" rather than any broader understanding of the situation. Based on what I have seen, in canon, regarding Thazi, I don't think there is something that will convince me that this perspective on him is true. I could be wrong! But I am struggling to come up with any cold open/flashback scene that would make me say "Oh, Bolaire (and Taliesin) are right" that wasn't a hacky "what if everything you knew...was a lie" twist that would make Shyamalan go "oh come on."
The second is that we know from Shardgate that part of the problem is that Taliesin has demonstrably thought that someone saying "don't do this, it might kill your character" four times secretly means "do this." I love Shardgate! I feel like it's even true to Ashton's characterization! But it does give me serious pause that this wasn't a case of "I'm playing a punk rebel who does the opposite of what he's told," but rather "oh, I thought he didn't mean it." Or in other words, I have what I feel to be valid reasons to think that sometimes Taliesin thinks there's a secret deeper puzzle meaning when there's literally not, and I feel that is a significant factor here.
And to build on the previous, that's what gives me pause. Again, Bolaire the character loathing Thjazi? Makes perfect sense! The issue is it feels Taliesin thinks Bolaire's singular experience is objectively correct. To contrast, Julien also loathes Thjazi, far more openly, and has done far more harm to him for that matter, but Matt, when out of character, is like "Julien is a privileged, arrogant fucking asshole," rather than "Julien spitting on Thjazi was the right choice because Thazi is terrible." Or Occtis, in-game, feels a certain way about killing Frons, and justifies some of House Tachonis's more oppressive practices, but Alex, out of character, is well aware that this is because Occtis is young and sheltered and traumatized and has not fully unpacked the harm his family did to others. I do not feel Taliesin has that same separation of his understanding vs. Bolaire's.
