What you're describing is nothing more than PIS. Brolly can nuke the galaxy. The only reason he doesn't is because the Plot forbids it, because otherwise he'd kill all the Z-fighters instantly as well as any other resistance and the movies/series would end instantly. You repeatedly saying "He can't do it!" doesn't negate the fact he did
do it right at the very beginning of Movie 8. It's quite undeniable, considering also, as I've explained, he did it in a de-powered form.
Also, stop trying to use other Movie feats to prove something for Goku when he does not get them. Movies are Non-canon for use with Goku. Brolly's are Canon for Brolly only.
You continue to try and pull non-canon crap for Goku and then say Brolly can't go SS3 when the Games are just as non-canon as the instances you're describing. In fact, I'd actually say some of the game storylines and "What If" parts are more trustworthy than most of the Movies. So why should anyone listen to your crap when you spout non-canon nonsense to try and prove your point but then say someone else can't use the very same line of reasoning?
In fact the only 'canon' movies that could be inducted into the series are; "Dead Zone", "Bardock: Father of Goku", and "History of Trunks." Aside from those three and the new movie done by Toriyama, None of the other DBZ movies fit into the series and thus cannot be used as evidence. The only reason why Brolly's feats are included is because Brolly himself is strictly a Movie Character and thus his abilities are included in full. In the end, Brolly is still the most powerful DBZ character ever made.