And other than footwork, that is the only thing that he has on his side in this matchup, IMO.
The fact that he's been training Muay Thai for 6 years doesn't mean much, because Darren Till has been training it for 13, and has been doing it since the age of 12.
At the end of the day Darren Till is still a Muay Thai fighter, and Wonderboy is still a Karate fighter. Its evident when you watch them fight. Wonderboy still fights in his karate stance, which leaves his lead leg exposed to leg kicks, and he still will get dominated in the clinch if it ends up there because Till has much more experience there. Stylistically, Till presents the hardest fight for Wonderboy in the division IMO other than Woodley.
The only reason I wouldn't bet on Till is because like you said, Wonderboy is overall much more experienced in MMA.