Not a stress fracture, but hairline fractures still need rest.
But these guys are superhuman are they not!!!
Either way it's most likely repetitive stress/eroded/weak bone up until impact then hairline, otherwise the (MOI) impact on good bone would have to be enormous, perhaps then involved other bone- we didn't see that.
But who are we, their Doc's are paid to be superhuman too.
Love saying I told ya so with my limited degree, but loathing putting a great player at risk.