Okay, a few questions because I'm genuinely interested in sorting fact from speculation/deduction.
I'm unsure, as far as 'shadows' go, what is real and what is not (I guess you could say I'm jumping at shadows :shock

. It seems many people see an empty seat next to them and say "I have a shadow" - I see an empty seat next to me and say "I have an empty seat next to me". I'm not suggesting the concept doesn't exist, just that people seem to see 'shadow' when perhaps they are just looking at 'unallocated seat? How do I tell the difference?
Is 'shadow' official terminology related to the res/seating system (ALTEA I guess)? Or just a term coined on an FF board to describe a situation? How much of what is said on AFF re shadows is speculation/logical deduction, and how much is fact?
I understand the concept of blocked seats, and have been the beneficiary before (the check in agent advised me of same). It makes perfect sense for an airline to try and ensure their higher-tiered FF members receive the benefits of empty neighbouring seats ahead of the lower-tiered ones.
It would be nice if I could use any factual info to assist in my seating arrangements, but I do struggle sorting fact from speculation, and I suspect if I asked 10 different AFFers to explain how shadows worked I'd get at least five different explanations! Or maybe not, hence the questions.
