Izzy looked bad against Kelvin. After 4 rounds Kelvin did more damage and then completely gassed, as he always does.
Back on TUF Whitaker ran laps around Kelvin in the challenge. He has no cardio.
Since then Gastelum actually got worse.
Izzy also looked bad in a no show fight against Romero and lost that "fight" in my opinion.
Lost to Strickland
Lost to Pereira, but looked good
Lost to Jan
Close fight with Whitaker II, some say he lost
Looked bad against grandpa Anderson
Looked great against Whitaker 1
Costa
Cannonier
Hail Mary against Poatan 2
At championship level he actually is a bit 50:50 with some luck
To be fair Strickland beat the shit out of Izzy for 25 minutes so I think his word holds some weight
Izzy won the 2nd round and the 3rd was close.
Sean mauled and schooled him for 15 minutes, to be fair