I somehow feel Jadeja should be one of the spinners if India go with two spinners. Jadeja the batsman is in form going by the warm ups and its always better to use a player who has hit good form. Also Jadeja's fielding is world class and saves crucial runs for the team and gets us crucial run outs/catches. And he can be tight in the middle overs applying the choke while the chosen leggie at the other end can attack (to me, it should be Chahal as of now on form).
These are good batting conditions and its no surprise that Bangladesh are batting well. Bumrah has been good and Bhuvi has been frugal with the economy. Chahal is getting into his groove with that double strike. Kuldeep and Shami are the ones that hasn't had it good so far (I did not expect anything from Shankar, the bowler) but Shami is in overall excellent form for the past few months, and Jadeja has been very tight. Nothing bad so far from our bowlers.