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As for there being a pivot by the axle and 'not being a high pivot', em... what? The axle path and the position of the IC define it as a high pivot since it has those characteristics. And requires an idler to not have deathly pedal kickback (and to have a decently LOW antisquat value). The Wilson is in fact a relatively high pivot bike in current form, but without an idler. And in that case it's still a split pivot, since the brake is attached to the chainstay. Which in the case of the wilson is the floating link, unlike most single pivot bikes (it is still a single pivot bike kinematics wise, like all split pivots and ABPs).
You could even make a high pivot (effectively) out of the old Lapierre dual short link (X-control) layout by throwing the links around in a correct manner. You just need a fully rearward axle path and you're there. Yeah, 'high pivot', but for all intents and purposes given how it would ride, it would fit the criteria.
Damn I missed geeking out on tech 😂
But, yeah, leverage ratio through the stroke can get quite a bit different here, but the main kicker, IMO, is the frame construction. The current HSP is touted as 'revolutionary' because it went straight to carbon. Because Al couldn't be used to make the high stressed swingarm. Which, to me, is just bad design. Why would you intentionally design it with high stresses? The Druid has no such problems (designed by the same guy/team as the Aurum HSP). And as long as you don't go full Horst link (with a seat stay pivot, just to confuse people not as well versed in technicalities :D), you'll have similar braking performance anway. Therefore my above comment regarding brake squat levels. Are they actually something you want given these designs?
Regarding the Norco, it's debatable. Debatable as in depends on where the swing arm flexes (if it does indeed flex only). If the seat stay flex, it's this. If the chainstays flex, it's a linkage driven single pivot. It's probably somewhere in between.
The thing is that with a flexing suspension layout you can't really define it kinematics wise, you have to do an analysis of the structure with it being elastic to determine all the paths and angles of rotation. The rotation of the brake mount piece will determine how close to a single pivot or a four bar it is and, most importantly, what the 'effective' linkage for it would be like in order to calculate all the kinematics.
Honestly, I can't see it. Can't wait for a better picture.
Will someone pay me to spend summers in Whistler taking photos of weird bikes?
Hovever i still cannot see a brace in the rear triangle