According to the Weißbuch GIMME SHELTER II is a "new lead vocal track", "using "war...children" instead of version I. But it does not say it´s Keith singing.
1. Is the version you are referring to GS II? 2. If it is, is it 100% Keith singing? 3. What about GS (instr.) It´s not listed in the WB at all. Is it real? Or did someone edit the lead vocals down (they can be heard as ghost vocals, a bit delayed).