Obito (supposedly) died at enemy territory, at time of war, while doing important mission... they simply couldn't do it, they had to dispatch the enemy, quickly move out before even more comes, bring unconscious Kakashi along the way and finally finish the important mission.
Obito wasn't given a grave. He was given a monument, or rather his name was inscribed on a monument, which carried names from before his time as well as those after, like Hayato's, who was killed right before Oro x Sound x Sand sneak attack, while spying on Baki-Sand Guy (he basically sacrificed his life for the village).
On the other hand, it was Rin that was given a grave, which means she died at time of peace with her body retrieved, without risking her life for the village. Frankly speaking, you better be prepared for some rape scenes or implications... after all, she was one of the most beautiful characters, not to mention Kakashi's Thousand Years of Pain combined with Raikiri, seems like an ideal way to, take revenge for you know what... nah this is shounen, they can't even suggest that... I think

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