This underestimates Kuhn's novelty, though. Even Popper accepts that discovery is not a rational process. Kuhn is saying something, it would seem, about the context of justification.
Logical consistency is a very weak requirement.
One of the theories might still be best supported by the evidence. A person has reason to believe a statement only if it is logically implied by statements recording her observations. THE TIME Good reasons are only a small part of the explanation of why scientists adopt a new theory and reject its competitors.