BoTRK and LW

Hi, I was just wondering whether I should be building Botrk on jungles like shyvana if the enemy team has no tank, and if yes then why, if not then what do I switch it for? Not only shyvana but if you blind/teambuolder pick vayne and they have no tank do I still build LW/Botrk? If not what do i build instead? Any help is greatly appreciated.
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