I think people are overrating the revelation that Manafort shared polling data with Russians...
But underrating the revelation that Manafort was working on "Ukraine peace plan" (i.e., sanctions relief) and links to Veselnitskaya. 1/
A) Manafort shared polling data with Kilimnik (Russian agent)
B) Manafort discussed "Ukraine peace plan" with Kilimnik
*while* he was campaign manager.
There are significant signs already in public domain of such a bribery scheme, and I suspect Cohen and Flynn corroborate.
But the "Ukraine peace plan" more specifically connects dots of quid/quo from the RNC convention events up through Cohen/Sater/Flynn (all of whom are cooperating)...
Sharing polling data? Lacks cooperating witnesses who'd give it criminal context.
But the "Ukraine peace plan" is the bombshell connecting dots with cooperating witness (Cohen/Flynn/Sater)