Currently, I do not see the point of having two spinners doing essentially the same job at the expense of an extra seamer / batsman.
New Zealand did it with Vettori and Patel, and it backfired in the 3rd test against England.
Now India has exactly the same problem with Kumble (capt) and Bahji.
Be interested to hear what other people think.
What about having your spinner as your captain? Is that a good thing or a bad thing?
It's especially disastrous (in my mind) when the captain spinner (Vettori and Kumble) do not generate enough turn as a specialist spinner, and they get another spinner in. It's a waste of resources in my mind.