The fact hes a Gorosei establishes him as a top tier at the very least. God Valley ass whooping probably humbled him and triggered for needed growth. So for sure he got stronger after God Valley by good amount.
Some more than others but to me even 40 year old WB get somewhat stronger .
Just that there differnt levels to it like Kaidio would have seen biggest growth after GV compare everyone else.
People want to think BM was in here prime at GV but she don't even have her sword which she uses in half of her move set in WCI and Wano .
Hell her CoC clash with kaido was using her sword and the same with the combine attack they did .