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Not every list BA comes up with is a collaborative effort. Each of the rankings for individual teams is done by a single person which means it reflects just one persons opinion. They are also heavily influenced by what that club thinks of their players. So the ranking of Halman #1 this year was the decision of Matt Eddy alone, and it could have been because the M's were super-high on him. I think this is a perfect example of why ordinal rankings are a terrible way to convey information.
Also, Saunders is not the type of guy BA normally drools over. Instead, scout types have been very slow to warm up to him, so if scouts are now raving about him then I would take what they say very seriously.