To me he's in the top 10 LW of all time.
He has wins over Mcgregor, Cerrone, Johnson, Maynard, Miller, Guillard, Gomi (out of prime though), Pellegrino..
He is damn hard to fight, with a long reach, an amazing cardio, hendo-like chin, and top notch jiu jitsu.. Just like Nick, he is a volume puncher, a great user of the jab and the quick one-two combination.
I wish he would have used his grappling skills more often (like in the guillard fight), because that would have spared him some scars and years of his life.
Anyway, a great warrior, and a missed attribute of the LW division. He may be back against Conor to end the trilogy, or maybe for a big fight, but until then he had a great career overall. With a better resume than his brother Nick.