Thinner person jiggles more?! Why?

Hello everyone my and my friend have practically the same build .. Wide shoulders .. Wide hips we both bech I'm benching185 and he's at 195 .. We both also clean and jerk I'm at 135 and he's at 145 .. We both have lost weigt .. Me 40 and him 10 ... My skin is not a problem it is not loose at all because I lost weight by doing insanity and body building .. Eating right aswell in order to avoid it ... Anyways my belly is smaller our chests about the same ( his little bigger) my pecs have little fat and I can see my abs .. I weigh 165 and he weighs 185 .. Same height and everything! Why do I jiggle more when I jump? I remember reading somewhere that if you diet .. I.e me (he dosent) then your fat gets pushed to the outside on top of your abs and stuff .. Is this true and is this why I jiggle more? Please confirm or deny this .. Thanks

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