Don't agree that he rode his luck. No fouls that he committed on Saturday were worthy of more than the single yellow card that he got. Motherwell players hitting the deck as soon as they're within spitting distance of Gueye doesn't constitute him riding his luck IMO.
I thought Gueye was good at the weekend. I do note that I appear to be in the minority there right enough. I thought his play was mostly tidy and he causes defenders problems. And as you say I think we might need his physicality.