Mulitple things about the brawler...
First of all. If you didnt increased you stats in the brawler game in season 1-2... yeah well... you are pretty much screwed. Cause you will miss some points at the start of episode 10, For every stat on 4 out of season 1-2 you will get one bonus point in ep10 starting with 1 in all stats, besides those which are new. And those are really helpful in the first fight against troy to get the first 2 skillpoints.
If you managed to beat troy, put as much points as you can in SPEED. Speed > all. Thats the same btw with the Brawler game in Season 1 and 2, but instead of speed, its DEX. Speed will increase the reaction timer significantly. Like... you have at least double the time to hit the buttons for each speed point like without them. I for one fight troy 2 times, which will give you 4 skillpoints, i spend 3 of them and save one... after fighting against chao, you can put a third point in every stats on top, so... third point in speed and dwayne can eat dirt.
With 2 points in speed and normal mode on... brawler becomes pretty easy. Not THAT easy like the brawler game in season 1-2 but lets say... very fair. I admit, the dwayne fight still remains a challenge even on normal-mode... cause one fuck up and you are screwed or one to many blocks. But well... you only have to beat him once.
I managed brawler on hardmode, but didnt bother after my second playthrough. After my second playthorugh i went with normal mode all the time.