Yeah I don't know about middle sixers. They obviously had a rare combination of skills. Usually when hockey players are at that high of a level, they are at least good skaters and usually great or elite skaters. The Sedins were below average. Their collection of skills is so unusual if you look at it, you might not expect an NHLer
- below average skating speed
- below average acceleration
- average edges
- well under 200 lbs
- not the hardest shot but highly accurate
- elite vision
- elite hockey IQ
- elite fitness
It's such a unique and unexpected combination of individual skills, but it obviously can produce Art Ross level talent. Similar skill package, interestingly, as Gretzky, another insane endurance-athlete. Also like Gretzky, their shots were very accurate -they both did extremely well in accuracy skills competitions. I guess when you have those two skills, vision and IQ, not just great, but elite, you can be surprisingly good.
One other note, they each performed similarly well if not better when they were separated from each other (Daniel's Art Ross year when Henrik was injured for example) so it wasn't just that they were amazing because there were two of them.