Would it even matter who among Jared, Jr & Kushner were most culpable? The three of them were aware of the pre-text for the meeting, knowing the party offering the information represented the Russian government, and turned up for it - they're outed.
It's a testament to how strong the propaganda machine that is radicalizing the Republican base is that they can still have this spun to them as something other than what it is; solid, and remarkably admitted to by Jr., evidence of collusion.
So now, at least publicly, it has moved from multiple stages of denial.
-'Russia didn't interfere, fake news, fat guy on his couch did it!'
-'Russia did it, we had no awareness or involvement'
-Russia did it, we attempted to collude and met with a Russian representative, but they gave us nothing, so it's nbg'
We've seen enough that is more than ample to expect arrests when Mueller is finished and indictment day is executed. I'm expecting we see Flynn, Manafort & Stone arrested. Then quite likely Kushner & Jr. as well.
Also the earlier stages only represent where things are at now. There is now enough exposed to expect that there reasonably was an exchange that was fruitful and involved a real attack. My bets are that given the timing of things, the emails Russian intelligence hacked and gave to wikileaks were known beforehand to the Trump campaign. I think this is what will come out eventually.
I think Trump's day of reckoning will come with the arrests. They can pivot to witch hunt and heresy! cries, until it is litigated and if it results in convictions. Regardless I expect the stench of arrests of people in his circle and that he will likely resort to pardons - rather than let them be dealt with by the law - should be enough to sink his ship.