Izzy did not look “off” of “having a bad night” as Dana put it. He looked like himself, the same as he always does against guys who check leg kicks.
All 3 of Izzy’s losses in the UFC have come to guys who know how to check leg kicks. He relies on the leg kicks as his main distance strike and a round winner when the hand striking is even.
When he doesn’t have leg kicks to rely on as his main volume weapon, you realize how limited his hand striking actually is. He still kicks to the body and head, but he still is forced to use his hands a lot more.
Jan B, Alex P, and now Sean Strickland have all shown that one of the main keys to beating Izzy is to know how to check leg kicks, so that Izzy can’t rely on them as a round winner when the rounds may be fairly close.
Wouldn’t be surprised if DDP has a lot of success against Izzy in the future, as he checks leg kicks very well.