You can see the guy moved like lightening. But his technique is subpar. He was always a decent grappler but a sloppy striker. What always saved him was his physical characteristics. Speed, explosiveness. Coupled with his super fast transitions between striking and grappling.
In your OP you’re saying he is a generalist who’s not technical in any one discipline. I’m saying he must be technical in Judo to have had that level of success.
Why train at a Sambo school if youre winning gold medals in Sambo events?
And id say his striking was more than mediocre, at least early in his career.
He fell in love with the knockout and just went out there throwing heavy leather later in his career; his best trait used to be a fusion of fast, heavy combinations to overwhelm the fighter in order to transition to a clinch/throw to the ground followed by heavy ground and pound.
He was a true mixed martial artist. He wanted to be a knockout artist the older he got and that was a big factor in his decline i believe.