There is no marked path from westliche hochgrubachspitze into direction of Ackerlspitze. This is a very exposed climbing route in 2. grade uiaa. i went there and was quite surprised.

in my opinion, this path should be removed for alpine safety

references: 
https://www.stadler-markus.de/alpinklettern/wilder-kaiser/kletterroute/gratuebergang-von-der-westlichen-hochgrubachspitze.html
https://www.stadler-markus.de/alpinklettern/wilder-kaiser/kletterroute/gratuebergang-von-der-ackerlspitze.html