Theory Estas Kid can be son of Shanks.

#1
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lets say at age of 14 or 15 shanks eat some of fishman tatamebako box pills...he grow up little in age then screw with estas kids mom..

later she give birth to estas kid ..

shank can be estas kid father ...

or he can be sent little forward in future by oden kozaki wife to do same operation to kid's mom..
 
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