This thread is wild. It's shocking they'd issue consecutively numbered passports to spies. Using random numbers seems like it would have huge benefits for essentially no cost.
That's the call where Alexei Navalny tricked an FSB agent into admitting they had poisoned him.
I think often people try to come up with too clever explanations for stupid behavior. Sometimes it's just stupid behavior. Often times this is the catalyst for conspiracy theories - it's a nice explanation for random or stupid events.