This page shows 5 unidentified Gulls that have kumlieni-like primary-pattern. All these birds are similar to vagae/'taimyrensis' in their size, structure, iris color, and mantle shade. Interestingly their molt seems to be very late.
Note the very worn outer primaries.
A large individual
The P10 is still a littler short.
This individual still has old P10.
A small individual.