Mafia 47. Battle of Movie Heroes

And I don't understand why we suddenly started trusting Guru.

It's not very wise to execute a person based on the opinion of someone you don't think is trustworthy. Just saying!
We're unlikely to execute Lord anymore. Zubr pointed out a very important fact – we've already decided to trust the notes and cunning plans once, and where did that lead us? We almost executed Arandor instead of the maniac. Overall, Zubr seems quite suspicious to me, but not enough to execute him.
Ah, just in case, I'll say that I understood all your hints, but personally, I don't see any reason to trust Guru.