I beelive that W Silva got his new trainer(7 times BJJ champ) to live in his house for a reason
I think he is training to use BJJ more offencivly the he used to.
Specialy now that he can use elbowes.In the past Silva have used it more for defence.When facing guys like Arona he have been able to survive on hte ground wich is not easy. It shows that he got a lot of BJJ skills.
To get a belt in fight sports should be more looked like a study where you show up to read and learn over many years. To have a black belt does not mean the same as you might submitt anyone/kick any ones a**es.
All fighters in MMA train to not get submittet, that makes it hard very hard to pull it of.