I think the main problem with Bisharp, as much as I like it, is that it only fits onto Hyper Offensive teams well, which we haven't really seen at all during this SPL.
Yea, on paper SD Bisharp sounds like a nice win condition and Pursuit Bisharp sounds like amazing support, but when you take a closer look that Tyranitar or even Mega Scizor do the Pursuiting job way better (or even Weavile, although I think Pursuit Weavile is pretty dong too and it'd rather have Low Kick or PJab), whereas SD Bisharp just isn't a reliable win condition unless you stick it onto a Hyper Offensive team where you can just "gang up" on the popular walls to "physical Pokemon" such as Hippowdon or Garchomp (although Rotom + Bisharp counter complicates that a lot recently, admittedly, I FUCKING LOVE ROTOM), but on a Hyper Offensive team with stuff like Talonflame or Pinsir or even both it's absolutely fantastic, In my opinion. Being able to punish Defog reliably is something very few Pokemon can do, and I'd attribute Bisharp falling flat on its face more to people trying to use it on other playstyle/HO not being very common, rather than Bisharp being flat-out bad.
Clef/Rotom/Hoopa having obscene win percentages (especially Hoopa lol) just reinforces my thoughts of those 3 being top 5 Pokemon in the metagame right now, though. Garchomps win% seems a little high to me, but I'm pretty sure most of those wins were offensive Garchomp sets, which fucking wreck, instead of that TankChomp nonsense (me vs Cicada, me vs Geemick, both being battles that I was involved in where Offensive Garchomp won).