May I know how much LHC has constraint the parameter space of the subquarks (generally known as preons)? What models are still viable (I'm focusing on the subquarks and not other particles like electrons as made of smaller components)? I hope ohwilleke can share some insight as he is the lead author of preons in the Wikipedia. And others knowledable about subquarks side of preons. I'm studying strong force confinement and I wonder if the quarks are sufficient or we really need subquarks to make it work. What is your opinion?