That's for sure true. So many new Nintendo IPs pop up here and there and we get a revival for a series such as StarFox and they don't get an extra newcomer, what makes Isaac special however is how vocal his demand is for over a decade. While some characters have gotten into Smash with hardly any demand you can't deny it has been the sole reason why some characters joined the roster like King K.Rool and Banjo. A new Golden Sun game doesn't guarantee Isaac making the cut but them not capitalising on it by giving him his long awaited spot on the roster would be a huge missed opportunity that would benefit both fans and the developers.
Golden Sun is also the only series lacking a playable representative that has a spirit for every class as well so that helps
Golden Sun’s representation has been insane the more you look at it. Especially compared to the last Smash games:
BRAWL:
•AT Isaac (with Move)
•Isaac Trophy
•One song
-Felix Battle/Doom Dragon Remix
SMASH 4:
•Two songs
-Weyard (Dark Dawn Rip)
-Felix Battle/Doom Dragon Remix (Port from Brawl)
ULTIMATE:
•AT Isaac (with Move, Pound, Lift & Teleport)
-Besides Gray Fox, Isaac is the only returning AT who also got revamped with new moves.
•8 Golden Sun Spirits
-All together have every class, etc.
-Isaac, Felix & Matthew appear in WoL
-Isaac’s Spirit Battle is in the final world and one of the best Spirit Battles in Smash (IMO too)
-Adult Isaac is one of the strongest Spirits
•Isaac Mii Costume
•Two songs (both ported from Smash 4)
-Weyard (Dark Dawn Rip)
-Felix Battle/Doom Dragon Remix
•Isaac Online Profile Icon
All that together, Golden Sun is the most represented out of all the Non-Fighter Rep series. Golden Sun only has 3 crucial things missing which are a Fighter, a Stage and NEW Music.
We are so close, Adepts! We have to keep pushing for Isaac now more than ever (and of course a new GS game)! We have nothing to lose and everything to gain from here on out!