Two Teams Hypothesis of Salisbury Poisoning
These teams did not know about each other’s existence. The first team, the professional New Abwehr’s poisons handlers actually dispensed the substance at a certain, ordered to them time and location and observed all the precautions and the conspiracy measures to be undetectable by cameras and witnesses.
The second team consisted of Boshirov and Petrov (which might be their real names, and might or might not included the third person, known or unknown to them), and their movements were made deliberately detectable so they, the “walking ducks”, could be identified as the perpetrators.
Looks like the version of the Abwehr’s setups.