No politics shouldn't be whites only , but blacks can't keep claiming to be " just as British as you are" on one hand whilst on the other hand claiming some sort of different status and pursuing an agenda against the country they claim equal status/nationality of , as for omitting the word "claim" , do you know gayle's ancestry ?? Is he west Indian ? African ? I doubt you know so I also doubt you can "safely" omit the word claim.
White guy turns down an MBE = principled.
Black guy turns down an MBE = pursuing an agenda against the country thus jeopardising the right of any black person to identify as British.
As for your other point, I'm sure you know that West Indians have African ancestry so I have know idea what you're getting at.