He deserves captaincy but that doesn't mean it's good for the team or him. Bumrah is the only premium asset in this Indian team and is worth gold.
Let's say he becomes captain and starts playing every test match. Mind you, we play close to 19-20 tests in 2 years It includes home season, IPL and 1 ICC tournament every year. That's a heavy workload for him and one of the reasons BCCI rests him in almost every whiteball bilateral series.
On top of that, we don't need his services at home regularly so we can't have a temp captain whenever he misses the match. If he's playing every test match then it's a different scenario but comes with a risk of injury.
Right, I didn't give thought about the workload management but lately he is being part of every match especially since his comeback from every match, isn't it? On that basis Pant seems to be the automatic choice for being captain and his test performance has always been great so when the captain performance it always pushes the players to perform well too.