The political race for numbers in Tamil Nadu threw up a new possibility late Wednesday that would have sounded politically improbable just a day ago: leaders of Dravidian arch rivals DMK and AIADMK are exploring a joint fallback scenario if Vijay’s TVK falls short of the majority mark, The Indian Express has learnt. Sources from both parties said one option being discussed was for the AIADMK to form a government with outside support from the DMK and backing from smaller parties. “Nothing has formally happened yet. But conversations among leaders and internal meetings across camps suggest that this possibility is no longer just theoretical,” sources said. The latest twist in the state’s post-election churn came after Vijay’s path to becoming the next Chief Minister hit an unexpected pause, with Governor Rajendra Arlekar insisting that the TVK produce documentary proof of majority support before any invitation to form the government.…