the focus on "lacing the leg" is misguided. that is not how it is called. all you need is to be behind the arms. the only reason there is every focus on the leg being inside on the first place is to make clear that, as the bottom man, simply stepping over that inside leg is not enough to prevent control (like it is in freestyle for example). as soon as carter lost his lock, was extended, and kem was behind the arms, it was two. fwiw, askren, who is as knowledgeable about these kind of scramble positions as anybody, is also saying it was 2.
for an example, look at rby-desanto pt. 2, first takedown:
desanto never hooks his leg or anything. all he has is he's behind the near arm on the side headlock and puts weight on rby's hands. 2 is given.
last i'll say. i understand this is a sysyphean task. you guys win either way on criteria.