I've never heard of that theory before about Hussie being Rose the whole time but when they changed "hussie's" text to be rose's signature purple I was convinced bro. Because now that I think about it, it doesn't really "SOUND' like Hussie lol. Like Hussie has a specific style of speaking and talking and well...I don't know? It sounds off, like someone else who is pretending to be Hussie. And sure, you could chalk that up to "this portion was literally not written by Andrew Hussie" OR you could go the more insane route and say "it sounds off because it was never Hussie at all and was a different character the entire time."