My argument is you don’t need to counter the original vote, only to make the difference between the two votes. It’s the sway that matters more than anything else.
Why there hasn’t been a counter pro-brexit petition yet I have no idea. Those numbers would be higher purely on the zealotry.
1) Unless the people who sign the petition had not voted (or voted for brexit, in which case you could even see it as a x2 effect) you can't "make the difference" using these numbers as they doesn't necessarily show any sway.
2) Why would there need to be a pro-brexit petition if brexit won the vote? That is unless cancelling brexit suddenly becomes the way that decision-makers want to go for (and note that there are pro hard brexit petitions)
Disclaimer: I do not reside in the UK, and I no longer click on every article in the ever-flowing torrent of brexit-related news, so my knowledge of the ongoings may be outdated
If the issue has already been debated recently, the Petitions Committee may decide not to put a petition forward –– and one might argue that this petition has already been debated in parliament.
This particular [petition] case is already active in the UK court, which means the petition does not meet the required standard to be considered.
I'm not trying to downplay the significance of the petition or its size, but I don't believe math works that way.