i think the director don't read drango ball manga

fully argee with u bro 

New form for Goku?

Super Saiyan God?

Erm.... then the form in GT is not relevant anymore...

It's not my idea that Vegito > SSJ4, it was according to the anime comics of 'A Hero's Legacy', not sure whether it's authored by Akira Toriyama himself though 
This is interesting, source?

Dragon Ball GT (ドラゴンボールGT(ジーティー), Doragon Bōru Jī Tī?, G(rand) T(ouring)[51]) premiered on Fuji TV on February 2, 1996 and ran until November 19, 1997 for 64 episodes.[4] Unlike the first two anime series, it is not based on Akira Toriyama's original Dragon Ball manga

Did akira toriyama create dragonball gt?
No. Akira Toriyama created Dragon Ball and Dragon Ball Z. He's directly responsible for the mangas, and worked closely on the production and writing for the shows with the teams at Toei. However, because Toriyama wanted to move away from Dragon ball to work on other projects, he allowed Toei to continue using his characters for GT, only occasionally sitting in on production meetings and passing along designs to the artists for the show. By the shows second season, (a.k.a. the Super 17 arc) between his own disgust and the fan rage, Toriyama wanted to pull the plug on the series, seeing as he owned the rights to the characters. Toei had a contract that gave them control for one more season, so in return, Toriyama jumped on GT in the final season, writing the Shadow Dragon arc to close out the series once and for all. He has not done any new canonical additions to the series despite 1000 internet rumors that he has. The closest thing to canon he accepts is the "Yo! Son Goku and his Friends Return!" TV special. He still produces for the video games and produced for DBZ Kai.

He's gone on record in interviews saying he disliked GT, has apologized for it, and has openly declared that it should not be regarded as part of the main continuity.