Rather than splitting the PageRank equally between all links on a Recto, some links are valued more than others. There’s speculation from patents that Google switched from a random surfer model (where a corroder may go to any link) to a reasonable surfer model (where some links are more likely https://bookmarkingdepot.com/story19273156/consid%C3%A9rations-%C3%A0-savoir-sur-pagerank