The tanking would make no sense in either in the anime or manga. For the most part with properly biological beings tanking has never worked like that. Tanking has been always dependent of the strength of ki. Which means that regardless of which one is it it makes no sense that hit would be able to take goku's or vegeta's attacks in any form. Would krillin beat cell with time skip? Of course not, with such an overwhelmingly large difference in power krillin would still be unable to even scratch cell regardless of anything. Even if a SSB vastly outclassing a SS is far more than a mere understatement. There shouldn't be vital spots that hit can attack that should be effective, his should straight up break his hand when punching SSB vegeta or goku.
The thing is that Frieza trained, albeit he rushed his training and did not completely master his golden form but that's another topic
It is hax but that was the only reason he was able to keep up, and he reached a limit at 0.5 seconds in this battle. They didn't talk about the power level weakness but it was implied as Goku was able to ignore the 0.5 seconds Time-Skips at at a moment of the battle. Then, Hit perfected the technique again but even with his this Goku tanked his attacks and dealt more damage than him with a single punch. Beerus and Champa were still stronger, he clearly felt threatened when Champa said he was going to kill him along with all the others. He's supposed to reappear again in another arc so I am sure they will talk about the limitations more clearly.
This one is for the manga. There are some problems with the links not fixed yet but it's in the Anime Series subsection, link: https://mangahelpers.com/forum/threads/dragon-ball-super.3000819/. You should be able to see it below in Similar Threads too.
thanks for the link. can i assume F. Bulma is already dead by ch. 14? Since the manga release takes more time than the anime, i wonder how F. Trunks will defeat Black in the end. Will they end it with Goku beating Black or F. Trunks gets SSGB transformation to beat Black.
Yes she is already dead. I am not sure if Trunks will become a SSB but according to the titles of next episodes Vegeta is planning to train him. It depends on the limits of Black's strength I guess.
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. And why did they choose to use Pilaf's gang again, especially Mai? Them being young again makes no sense at all, especially in the future timeline 
. Finally, I'd like you to notice that the children haven't grown up, despite 5 years have passed since Bu's defeat. This is a huge mistake, as trunks is 13 now, and it was already drawn in the chapter "Trunks: The Story" : http://dragonball.wikia.com/wiki/Trunks_The_History_-_The_Lone_Warrior 
Trunks overpowering Goku Black just like F.Trunks VS F.Cell will be good enough but it's going to be a lonely future for him..
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But this is just the race(Shin-jin), all of them don't become Kaioshin. Zamasu has been recruited to be a Kaioshin apprentice, meaning that they are not really chosen at birth. I suppose it is similar for Gods of Destruction.
I know that much, my point was more about berus seemingly not being a shinjin. If berus is not a shinjin and we consider that goku or vegeta could actually be gods of destruction then it makes sense virtually anyone could in theory become one.
Oh, I see. He might or might not be a Shinjin but power seems the main factor to become one. It's possible that he was once an apprentice like Zamasu is currently. And IIRC Kami wanted Goku to be Earth's Guardian once.