I agree that he has overbowled him in the past.
However, looking at the state of the ball and the pitch, I could understand why Root kept the spinners on, though maybe not together. I didn’t think Stokes looked likely to pick up a wicket either…
I think that Root wanted to give Leach a decent bowl at the end to rebuild his confidence after Pant destroyed him, though he will maybe learn to toss it up slower and wider…I had the privilege of playing with and keeping to a very fine left arm spinner at my club, who took over 2000 wickets over 35 years at a high level, including first class cricket and it was amazing watching how he varied it depending on batsman and conditions. His control was better than many Test spinners I’ve seen.
I still think it’ll be a draw. Pitch is too slow to be otherwise unless India chuck some wickets away again second time round.