I understand that, iain, but what it is puzzling is what it is based on. There are five SP listed for each league, and the implication is that these are the top five for each league, but what is completely unclear is (a) what are the criteria, and (b) where can "top tools" be found?
What is clear is that it is definitely not based on this season's stats, does not seem to be based on career stats either, and is also not based on overall rating.