Conor McGregor's legacy: Where does he actually rank all-time?

Strip away the spectacle. Strip away the trash talk, the whiskey brand, the PPV numbers. Where does Conor McGregor actually rank as a fighter?

The peak:

• Simultaneous two-division champion (145 and 155). Only fighter to hold two belts at the same time at that point.
• 13-second KO of Jose Aldo. Aldo was P4P number 1 and considered unbeatable at featherweight.
• Eddie Alvarez destruction at UFC 205. Flawless performance against a legitimate champion.
• Source: UFC Stats — McGregor's featherweight run: 7-0 UFC with 6 finishes.

The decline:

• 1-3 in his last 4 fights (as of latest data)
• Losses to Khabib, Poirier (x2 in the trilogy)
• Has not won a fight at lightweight since 2016
• Activity has been sporadic at best

All-time ranking (my assessment):

• Top 20 overall, not top 10
• Greatest featherweight of all time (alongside Aldo and Holloway)
• His peak was as high as anyone's, but the sustained excellence was not there
• Compare to Demetrious Johnson: 11 consecutive title defenses at flyweight, far less fame, far better longevity

The real legacy: McGregor is the most important fighter in UFC history for growing the sport. The UFC pre-McGregor and post-McGregor are different businesses entirely. That matters even if the fight resume is not GOAT-level.

Sources:

• Sherdog — career record
• UFC Stats — performance data
• Forbes — athlete earnings data