The gap between Syn Shenron and SSJ4 Goku Pre and Post.

[Let's Go Fearless!]

Syn Shenron tanked the 10x kamehameha of Goku which should make him 10x stronger than Goku. After everyone gave their powers to Goku which will bring his limits to beyond, Goku was able to toy Syn Shenron and could see everything just like he have an eyes.

So Goku's beyond potential is over 10x? Or its just another Toei's crap inconsistency?

 

[Six Trails]

There's really not much logic behind Ki blasts in any Toei production. Syn Shenron doesn't need to be 10x SS4 Goku imo.

 

[Pyro]

There's really not much logic behind Ki blasts in any Toei production. Syn Shenron doesn't need to be 10x SS4 Goku imo.

It might be argued that there is logic behind the blasts that matter, like the 10x Kamehameha.

 

[Disasters GoOn]

Syn Shenron could be anywhere from being 3x stronger than Goku to being perhaps 15x stronger than Goku.

The 3x comes from the fact that Goku somehow survived getting raped by Shenron before his limits were exceeded. The 15x comes from Shenron's tanking feat.

I personally go with 15x, as (out-of-universe-wise) it makes Shenron look like a boss.