Ashwin, Jadeja, Axar all are first XI players.
Remove them and we will likely lose to 5-6 test playing nations at home. A team like Australia will smash us senseless, they are visiting these shores next September, we remember the scare they gave our side in 2017, don't we?
Our spin stocks apart from main XI aren't good. We all saw Shahbaz Nadeem in the series against Eng. Sundar is strictly a batsman who can bowl a bit, his darts are more suited to T20 cricket. Jayant Yadav is a journeyman cricketer who can never lead an attack. Our backup offie is Krishnappa Gowtham, did you check how he bowled against SA-A recently? Couldn't land 6 balls in one place, in fact a full toss every over, no skill or zip whatsoever. Most of the other youngsters like Bishnoi, Chahar are white ball prospects atm, test cricket is a different game altogether.
Our second string batting unit isn't weaker because we won't have the three senior leeches. Not stronger either since Rohit, Pant are big misses. But test matches are won based on bowling strength and we have been dominating at home for a considerable period of time because of our lower 5.
Visiting teams will have a gala time against our second XI spinners, they are made to look much worse than they are by our first choice spinners who are relentless. Will not be the case against Nadeem, Yadav, Sundar and we will be under pressure every single match.
Don't overrate Indian cricket.