Jaracz was appointed to the GB in 1974 and Leo Greenlees was removed in 1984 so the abuse issue in the GB was years after Jaracz’s appointment. Nevertheless yes Jaracz’s appointment to the GB after being dismissed from the Australian branch is curious, if that is what happened, because surely there were other anointed brothers to choose from that didn’t have such a history. The GB was larger back then too, so there weren’t exactly short of people anyway.
As for why the Australian Lawyer knew Jaracz by name it’s possible, or even likely that other ex-JWs had asked him the same question, or asked specifically about Jaracz in the past.
To date Jaracz is the longest serving GB member ever at 35 years. Lösch would need to live another 6 years to overtake him.