IIRC, David Brown was dumped as weatherman during the 2012-13 summer period and appointed “network meteorologist”, though retained his role on the national 4:30 news.
He later became the weatherman on the Sydney 6:00pm bulletin (as well as the national morning and Sydney afternoon bulletins), before retiring in 2020.
Re: Simon Pristel - he presided over a very tough period for Seven News in Melbourne which only won something like five weeks between 2012-17 (all in 2016) inclusive? It wasn’t that Nine News was very strong (as is still the case today), it was more Seven News being very poor, IMO.