The reason why Jones seems unbeatable is because he is the best prodigy the UFC has ever had. His last fight with DC he wasn't really trying he fought DC before that knew his style, and knew how to beat him easier. Gustafson he fought him way back and Jones is a quick learner.
His reach and his kicking skills are some of the best in the division because he uses them very uniquely.
Those eye pokes he only does them like what 2x max a fight most of the time other times it's actually an accident? Let's say you get eye pokes in one eye. You have good vision and you have really good peripheral. Plus the adrenaline in a fight. That means you can still fight your best just 2% less advantage. The round ends you have 30 secs or 1 min to recover right? I've sparred with people both in the mma gyms I trained at, and in the YMCA I workout at with mma gloves on and I can still fight at my best when I eye pokes in one eye. I was able to slip and clinch real well. It should only take 10 secs at most to recover from that 20 secs if anything if the eye pokes is that bad.
Jon may have used steroids but that doesn't give him more kicking power or more durability. Despite the failed drug test he is and will be one of the greatest mma fighter of all time. And will remain there even without steroids because if he stops taking them he'll still be in the best shape of his life doing his s&c training the same way.
