Looks good. Tires are a little worn, but plenty of life left in them.
One upgrade I would recommend is RPM arms with their mud guards. Little rocks can kick up and get caught between the arms and axles, especially the rear ones.
And of course, replace that front body pin 😉
If the body has not...
It's not going to hurt your ESC. But if your batteries are not able to deliver the amperage your motor is pulling, the batteries are going to struggle to keep up, causing them to get hot. When LiPo batteries get hot, the chances of them venting and turning your RC into a puddle of molten plastic...
6s Kraton? If so, it is a heavy power hungry monster. I personally wouldn't run adapters on ours. Will it be ok? Probably. But I would give it a few quick blasts then check the temps of the connectors and batteries.