Not much...it's kind of beating around the bush. You make it seem like it's something "brilliant". I don't think the mangaka is all that dedicated to making this plot interesting enough. Sort of inconsistent.
Nothing much has been revealed about Kara...not too much information.You're kind of quick to hop on a bandwagon...
This is you giving credit, where credit is absolutely not due.
Not all that suspenseful...however, it was SUSPENSEFUL when they FIRST mentioned it, now they're just procrastinating...and the more they do that, the more interest I lose in knowing what this stupid vessel is. Honestly, kind of the least important thing going on in the manga, ironically. More concerned about that Ao vs Boruto battle...
who KNOWS what's in that vessel, at this point, don't really care as much as I did the first chapter it was mentioned. Too slow paced.