Absorbing God Ki to become as strong as SSG in Base isn’t accepted for Manga.
How
exactly is the
God's Crimson Radiance concept accepted by the Wiki? Because, first and foremost, the film version of
Dragon Ball Z: Battle of Gods is canon. Even if, in the
continuity of
Super, the events of the film are replaced by the events of the first four chapters, both
Chōzenshū 4 and Viz itself (via the English release of the manga) confirm the film version of
Battle of Gods is canon; and in fact, even the "Saiyan Special Q&A" published inside of
Saikyō Jump, which is based on and written for both the
original series and the
Super manga,
includes interview answers by Toriyama expanding upon the lore first established by the film version of
Battle of Gods—including the character of Yamoshi, who
never appears, whether physically or retroactively, and is never referenced by any of the characters on-screen during the
Super manga.
The only way Goku could be capable of becoming a Super Saiyan Blue during the events of the film version of
Dragon Ball Z: Resurrection 'F'—which is explicitly within the continuity of the
Super manga—and later becoming a normal Super Saiyan God during the battle with Hit, despite Super Saiyan God being a temporary existence, is by—like in the film version of
Battle of Gods—physically adapting to the Super Saiyan God form throughout his battle with Beerus and then ultimately "absorbing" the
realm of the gods into himself and fusing its power into his own potential, which simultaneously increased his
Battle Power in his normal form—to a level which both the film version of
Battle of Gods and the
Super anime establish is comparable to, if not entirely equal to that of his previous Super Saiyan God power—and allowed him permanent access to the form to transform into later, like any other Super Saiyan form.