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However, I have never seen any explanations regarding the apparent linking filaments - clearly not possible over the distances involved.
It would be very problematic if the filaments were really there as it would mean QSOs were not very distant after all. You may be right PhysBang though on a few pics I've looked at the filaments look real, but then it could be a coincidence that the QSO was behind the filament. I have only looked at a few selected ones so no statistics to discount this as a random chance.
Whilst there are some that are obvious lensing - seeing the same QSO as multiple images for example - there are others where the QSO is some way off the cluster but too close to be "not associated" with it (or so it was once thought).