Yes but at the same time he was connected to the Populares, and we still have a Populares contact amongst us in the form of Maxima. I believe he could therefore perform the role of a transitional leader for the Empire - really though, with how they're writing Gabranth, he'd have made a better one, IMO. There is also the fact that lord Nerva is funded by house Brutus, which sheds some doubt on his role, but it'd be peculiar if such an alliance of convenience lasted into Garlemald's upcoming predicament. And there is of course Gaius as a spare option, who has condemned the Empire's worst aspects.
Personally, I don't find it too hard to reconcile these emotions with his usual state of mind, because they're not always emotions expressed in showy displays, but who knows, some trigger may switch his behaviour to be more overt about it in 5.5. It's worth noting the JP version also says something similar from translations I've seen of it, so EN seems to be the odd one out as usual; it does tend to take a bit more poetic licence with things.
This dialogue from 5.1 in the French version is interesting:
Because it almost sounds like he is aligning to that state of mind.[11:07] Homme à la robe blanche : Je suis un chien de chasse qui cherche un nouveau maître. Que diriez-vous de pratiquer votre sport favori en équipe ?
= “I am a hunting dog in search of a new master. What would you say to practising your favorite sport as a team?”
[11:07] Homme à la robe blanche : Notre éventuelle proie est encore endormie, mais une férocité sans pareille bout en elle depuis des millénaires…
= “Our eventual prey is still dormant/asleep, but a ferocity without such an end in it for millennia…”
[11:07] Homme à la robe blanche : Elle se nomme... Zordiarche…
= “They are named… Zodiark.”