Ask him how he feels about 50/50, inverted De la Riva, Tornado Guard, Z-guard, 93-guard (shield guard), single-leg X-guard, X-guard, deep half, Roleta guard, etc. When he inevitably shoots down half or all of them, ask him why he thinks Rafa Mendes, Cobrinha, Marcelo Garcia, Jeff Glover, Xande Ribeiro, etc (I could fill the list all day) are stupid enough to waste their time with these non-traditional new routes. I mean, they are no different than rubber guard or lockdown, it's just another set of techniques. You should ask if he thinks he knows better than all of them