|y wouldnt kakashi find him as you see in the last part ,u see kakashi looking down and sad as he didnt find obitos body|
Dude, if you are talking about the last page of the Gaiden where Yondaime, Kakashi, & Rin are standing in a pile of rubble, I've already explained that to you earlier in the topic. That picture is taken from the bridge they destroyed, not the cave in where Obito died. Go back and read Post #90 in this topic, I don't feel like writing it all over again.
By the way, the reason they are standing among the remains of the bridge looking sad is because even though they completed their mission, they lost a team member & friend doing it.