Updating the theory doc now.
Isaac’s assist just gives off that “last minute” vibe to me, like it’s something that wasn’t always planned. I think it’s the fact that it was shown at the last possible moment is what gets me. No other major ballot character was shown as an assist in that last direct except him. So why would they save their most requested first party character after Ridley and K Rool to the end instead of letting fans down easy like they did with literally
everyone else. Every other returning assist was shown in the E3 or August direct. Isaac is the odd one out. The best explanation I can come up with other than Nintendo is a jerk is that it was a more recent decision. I think the reason Isaac seemed to pick up so much traction after the August direct with the Rathalos tweet, the trademark and all that is because some sort of decision was made regarding him. If they decided to make an assist for him in that timeframe, they’d have no other choice than to show it in the next and final direct.
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Are you still with me here? Alright, let me ramble on for a bit more. So why would they make an assist so late in the game? Yeah Isaac is super popular, but it seems a bit random to decide on his assist a couple months from release. What if, and this is a big if, Isaac was planned for base at one point? Then it became very clear that there was absolutely no way he’d be done for base. Realizing that they bit off more than they could chew, they had to make some changes. I like to think his may have been a conversation at one point: “Forget it, push him into DLC we’ll finish him later, for now take what we have so far and make it into an assist! His movement animations aren’t done? I don’t know, make him teleport or something!” Then that brings up the question of why they would bother with the assist. Simply put, they pretty much have to. Other Golden Sun content is in the game like Felix and Matthew, if Isaac was mysteriously gone then people would think he’s a near lock.
It’s also possible they saw the massive jump Isaac had from the Rathalos Tweet and, while Isaac was DLC, thought Golden Sun fans might’ve been pissed if nothing substantial was in base after that, hence the assist.
I think I need to lay down, I’m going crazy.