Drake was probably just talking shyt. Could have been drunk. I know he's a fan & as a rapper I'm sure he gets that urge to want to try it, but I don't think he would go through with it.
If I were Mook, I would feel insulted. For Drake to challenge Mook, that means he feels he could win. The reality of it is, when you watch Mook rap, he seems very beatable. However, it's completely different when you are in front of him. I couldn't imagine any mainstream artist going out of their way to challenge Lux, regardless of how he did in his last battle.
fukk it lets see what happens
... "I'm doing donuts in the Aston..." 
