Im not saying that Obito forced Kabuto in using his edo tensei with his sharingan. Im saying that Kabuto demonstrated the edo tensei in front of Obito and with his sharingan he mustve seen the hand signs. I mean the technique wouldnt have worked if Kabuto used different hand signs just to lie to obitohe didn't use the sharingan to force Kabuto to do it.. Kabuto decided to show him cuz he didn't want him to face a Rinnegan user.. if you look at both pages of him making hand signs to t tObito and Itachi (which was forced by sharingan) they are different. If Obito really knew how he probably would have Edo'd the Jin by himself.. Plus Kabuto's a better liar than Itachi (according to Itachi)
the eye's dna is on Danzo's hand probably or still in his eye socket .. Kabuto said he could probably Edo Shisui because of Danzo's corpse. Tobi declined that he try.