Is the question of the Shapely Super Cluster Finally Solved?

So the Milky Way galaxy is being pulled towards both the "Great Attractor" and the Shapely Super Cluster. The Great Attractor is supposedly around 250 MLy away and rough calculations is that it is over 1000 times to mass of the Milky Way. Supposedly the Great Attractor is the Laniakea Super Cluster which is potentially made up of tens of thousands of medium and small galaxies.

We are also being pulled towards the Shapely Super Cluster. It is 650 MLy away.
Do we know how big the Shapely Super Cluster has to be to pull such a massive amount of matter towards it? Is there a paper that discusses it in detail beyond the Wiki?

Thanks