Help with Gull I.D,Barcelona coast (1 Viewer)

[mayoayo]

Saw this guy a couple of days ago among a few yellow legged gulls..the color of the legs made me focus on it and took a few pics..I assume its a Yellow L.with some transitional color in the legs,but seems a full adult and the color difference with the other adults its very noticeable..also looks a bit slimmer and longer winged(?)
Anyway.
Any clues?

 

[mayoayo]

A few more pictures..
Digiscoped with kowa 823/Baader Zoom/LG g4 @ 60x

 

[mayoayo]

Guess i answered myself..the black band on the bill means immature bird,and the orange pink legs are the transition between pink and yellow..
Naver mind

 

[lou salomon]

3cy or 4cy Larus michahellis it is