And what would happen the newly surrendered tribe like the Nogai tribe? Will they not waver?
They would waver. This is without question
Mayeux did not doubt this. Even if he is in the position of Nogai chief tribe, he would do this.
"the gift that my disciple had given me should not be squandered"
In a way, this is also his disciple trust in him. His disciple probably already knows that the Nogai tribe could be convinced with strength.
But if the strength is insufficient, then what choice the chief of Nogai tribe would choose is still up in the air.
The only way to always retains the loyalty of Nogai chief tribe is to make sure that Brolgadhr is always strong until he surrendered sincerely.
Nogai tribe would probably surrender with sincerity if the Brolgadhr tribe is strong and stable.
But if it's not stable, then there is great probability that the chief of the Nogai tribe would pretend that there is no such surrender.