Yup, it a warriors mind set like unohana's, it is her weakness that cost a child warrior(kid zaraki) to his current state, it was her weakness that made zaraki unconsciously weakened himself in order to prolong the joy and thrill of their fight.... it wasn't really her fault as you said as it is probably zaraki's ability or his zanpaktou that did this but unohana as a warrior woman felt it that way... a once proud killer with no equal or peers, the strongest kenpachi and the 1st one turned out to be weaker than a mere child <--this is such a big blow to warriors especially if they are projects similar to samurais

