All the recent surveys have been indicating that BJP falls short of the magic figure by a slight margin and Congress will be getting less than 100 seats in the 2019 Lok Sabha Polls. So, TDP Leadership might be implementing Plan B at present.
These days, Pro-TDP Media has been offering ample coverage to Nitin Gadkari who questioned Modi & Shah why don't they take the responsibility for defeat in the three Northern States. These Media Houses have been offering ample hype to the Union Minister in the recent past.
If Congress gets restricted to 100 seats, There is no possibility of UPA forming the next government. Why because, SP, BSP and TMC aren't okay with Rahul Gandhi becoming the Prime Ministerial candidate of the Anti-BJP Front. Few Parties have been supporting either BJP or TRS Federal Front. Most likely, KCR would join hands with BJP if Federal Front fails to get enough numbers. Several Regional Parties have been opposing Modi & Shah. Still, They are willing to support BJP if someone else becomes Prime Minister.
This is why Pro-TDP Media is showering its love on Nitin Gadkari. Chandrababu Naidu has been maintaining good relations with Nitin Gadkari since the time he served as BJP President. There was a good understanding between the two in the Polavaram issue as well. So, TDP Leadership might have decided to support Nitin Gadkari with the hope to see him as next PM.