Jadeja only sits if he's hurt.
I'm assuming/hoping Virat plays only 5 batsmen along with Ashwin and Jadeja, given the fact that Ashwin isn't injured and the # of leftys in the Kiwi XI.
Question is whether the Indian team play Mohammed Siraj or not - they may have to bench Shami to fit him in, which is very contrary to Virat's loyalty to 'senior' players.
Regardless, there's not much to worry about on the bowling front for India - they will be OK in spite of Virat's selection stupidity, and the outcome of this one-off test primarily rests on the competency of the batting unit. Which for an Indian fan that grew up on decades of Indian teams with cannon fodder for 3rd seamers, is....different.
For all of Shubman Gill's heroics in Australia, both him and Rohit Sharma have obvious weaknesses in their technique that really make it difficult to be optimistic about their chances in 'English' conditions. Gill is a #3 bat who converted to opener, in order to get into the national team. And as good as Che Pujara is, if he's having to deal with 10/2 in both innings, it just sets up the team to fail.
So not too worried about the bowlers, but just hoping that the openers surprise in a good way.
I expect India to have a different opening pair by the end of the 5 test series against England.