I mean, I think you're giving VAR far too much room there. These are both decisions where red is clearly correct (how much more forceful can you get than a players entire body weight being applied to an ankle, and the tackle was at least high enough to go over the ball first?) and we've seen VAR get involved for far less for Casemiro's latest red.Fair enough. But easily missed depending on angle. VAR still wouldnt step in on this as force, contact. Player not off ground etc was low. Now if ref had given red then VaR again wouldn’t step in and this is difficult for fans to get their heads around.
The on field official has clearly not seen the first challenge correctly - there's an argument that there's a C&O mistake purely in the fact he's not given a foul. So we've reached the C&O threshold immediately. The only remaining question therefore is if the VAR sees it as a red where they can get involved, or yellow where they can't, and I'm a little surprised there's much debate on that.
Take out the VAR C&O question and I don't think there's much argument that the best decision for both is red. And any functional VAR system should result in this.