I also don't get why people think Thorek wouldn't be subtle in his dismantling of the Guild and would just go fire and brimstone on them. Thorek is very intelligent and politically savvy, and yes he's incredibly motivated and seems to want to perform a full on purge, but he can be subtle when he needs to. An example of that in this very update is his decision to meet Mathilde in her room, a decision that caught her so off guard she immediately jumped to an imposter because there was no way he could have sent it (at least that was her first reaction). The reason, as it turns out, is that he wanted to be subtle.
Thorek can do subtle. He can be patient too, as demonstrated by the way in which he carefully analyses things in every aspect and reaction before coming to a decision. We saw him go to work, and we've seen him in direct intense conversation. He's not always a destructive hammer smashing down and smiting the unworthy, he can be a precise instrument, a chisel when he needs to be.