1. Show instrument change label at start of flow | 2. Using Percussion kit

[prko]

To resolve the problem described in the following thread:

The Staff label for the player who has multiple instruments

This is just because of percussion, indeed.
It would be perfect if the following two conditions meet:

1. Percussion staff in percussion player is displayed with the player’s name.
2. Only the staff in the player with one single instrument display at the start of flow its instrument label.

Then I do not need putting temporary notes in the blank staves to set brackets.