I haven't seen such a random collection of powers in the Weekly Boss Battles for a while.
The Weekly Boss Battles are a great way to find the Nexo Powers with the quickest damage potential. Finishing a kill in under 30 seconds means each Top Knight only had time to charge and use 1 Nexo Power. The problem is figuring out which power won them a spot as a Top Knight.
It seems like this week's Top Knights are just equipping whatever they feel like or they know a lot more than I do about what is effective at killing bosses. Considering the fact that I've never been able to place in the top 4, the latter is most probable.