I think older wrestlers and judoka transitioning to BJJ is almost inevitable if they want to keep training - and for judoka it's a natural transition with newaza being the same. But the biggest difference for me was pace. Wrestling and Judo rules encourage competitors to explode into everything and smash uke into bolivian. You can do that in BJJ but unless you have pornstar cardio, you're going to gas yourself out against a competent guard player before your 2nd or 3rd 5 min roll.
BJJ tends to be slower paced and more methodical. And being a bigger guy, keep in mind that you have gravity and strength on your side so you can afford to take risks and play with positions without having to muscle things vs. smaller training partners. The goal should be to flow, even if you're doing it with intensity, and it's impossible to do that when you're muscling. Ironically it's usually smaller weaker guys who get good at this (because they can't muscle anything), but it's bigger guys who SHOULD be able to learn this faster, they just usually revert back to brute force because it's faster and easier.
Back to Judo, that's always been my goal on the feet. When I used to compete as a brown, I was still relying heavily on wrestling athleticism to force moves. But the smooth kuzushi I've always associated with nidan+ proficiency feels effortless. Going randori with those guys, they could just time me and reap, sweep or throw me in whatever direction I moved, like some jedi mindtrick shit. High level wrestlers I've trained with also seem to develop this ability although I've never seen it specifically taught in wrestling. Years of training outside of Judo and with BJJ guys who suck at TDs has made me more confident in my TDs but I've accepted that I'm unlikely to ever get great at kuzushi without consistently training under a good Judo coach.
