I feel like Feliks is actually better at the two handed cubic events than the world record list shows. In 3x3, everyone knows he's the best and he has 19 out of the top 20 averages, but doesn't have the single world record. In 4x4, Weyer has both world records, even though Feliks has 6 of the top 10 results in both single and average. In 5x5, Feliks is dominant; no need to list stats. In 6x6, Hays has an average that's slightly better, and the top 10 results is spread fairly evenly. Nowhere near out of reach for Feliks. In 7x7, Feliks has both records, and they're pretty out of reach for the rest of the world.
I'm not just being a Feliks fanboy.

Objectively, Feliks seems better than the number of world records he has. He's unquestionably the best in every event where he has the world record, and in the ones where he doesn't (4x4 and 6x6) best in the world is much closer between Feliks and the WR holders. Feliks seems more likely to gain records in 4x4 and 6x6 than to lose records in 5x5 or 7x7.
EDIT: also worth noting: Kevin did hold all four 6x6/7x7 records, for about 20 minutes.

It's been quite a while since that happened, if ever, so congrats for that.