Kimimaro got sick - he wasnt boched, Orochimaru didnt try to go into his body at all. - he wanted to but he didnt

The 'girl' is Orochimarus 2ND body swap - he says this vs the 3rd.

Orochimaru didnt want to have to swap bodies - it means he cant do it for another 3 years now, he wanted to swap into Sasuke more then anyone else so thats why he was so pissed about Tsunade not healing his arms.

The 3rd's seal was done to his knowledge to take away all his jutsu's (arm use meaning jutsu use) he didnt know about the other way to heal the arms - Orochimaru probably researched it afterwards.

as for his arms degrading over time, that wont happen due to the fact that he has 3 years before he can swap again. I doubt he'll have swapped if it just means he'll die a little slower and have no way out of it.
Orochimaru said to Tsunade that even if she didnt heal him there was another way, body swapping was obviously it.
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