The Dapple Dualies were usable but had short range, and their bonus of faster rolls didn't really make up for the lack of range against some boss Salmonid, and the Goo Tuber, as mentioned above, doesn't work well when its gimmick is hiding under ink and keeping its charge larger when space is already tight and you ink can quickly lose direct paths that force you to come out of ink, in addition to being slower to charge and shorter ranged to make up for that gimmick. The brush is already a very underwhelming weapon in Salmon Run, being short range and still needing a good second and a lot of ink to kill any Salmonid, but usually it can slide by as an egg grabber if the other weapons can make up for it.
In situations where you have an online team, with one or more member not aware of the rules (although technically this and other higher difficulty Salmon run event battles are listed in the employee manual you get after completing the training) that type of battle is probably going to end up a loss, due to either not being able to find the Goldie soon enough to get the required eggs or misunderstanding how the battle works, shooting as many gushers as possible and being swarmed by mooks.
The brightly shining enemy is the only way to get Golden Eggs during this battle, however enemies also pop out of gushers, which can eventually lead to them swarming the map in outrageous numbers if left unchecked. Instead of normal horde battle for survival and taking out enemies, the players are tasked with shooting gushers (grates with spheres that explode into gushers of enemy ink when hit) that have light coming from them with supposedly the brightest being where a Goldie enemy will appear. One of the most annoying is probably going to be 'Goldie Seeking' due to slight Unexpected Gameplay Change.