Nah, I don't consider Brock a good test for Thurman. Maybe in paper Brock looks good with high knockout percentage, but outside of Australia? No one knows who Brock is. And probably that fight is a make or break for Keith. It's test for him if you could still fight or not, the good thing is that he was able to win that fight and so his career continues. But against Fundora, not sure if he can replicate his performance against the towering Sebastian.
And against his performance against Tim Tsyzu, he should again that his first win is no fluke. Just to sad to see Tim going down this way. Fundora really took everything from him in the first fight and I don't see him becoming a great fighter like his father.
I am not really familiar with Fundora. I can't really say how good he is, and how good Thurman will perform in his fight against him. Anyway, all I'm saying is, Thurman did perform well during his fight with Jarvis and shows that he isn't facing "ring rust" as coin-investor mentioned since Thurman was inactive for 3 years.