Well, with his height (193 cm) he already makes the difference in the air. Jump 81 is the max value I'd go for.
Regarding Header Accuracy... Looking at the ladders, he's already among the best in the Chilean league, but I'd set with a 86 just as a preliminary value.
I'd still like to read some feedback from Reverend and other users before updating anyway.
"Willy Wanda is Chinese!!!"