Rank does not mean anything with coaching. I am a bronze player but have the issue of poor mechanics (translation of knowledge into gameplay for myself), and have been "blessed" to cap at b1 promos to silver twice when I try to climb.
I have also been a successful development coach, mentality coach, pick ban coach, and macro coach of not only developing teams like Rozenoir Esports, but I have also coached the, now disbanded, NACS hopeful team Underdog Esports. I have a pedigree with Maryville University who went 40-0 in their inaugural CSL season and have worked with other Challenger teams (none NACS, I have capped at Quarterfinals as a coach). I have also had offers from Lyon Gaming in LAS, as well as a LAN challenger squad. So do not say that you must be x rank. If you say that then your players are not serious about growth, they want their own ego's inflated.
~ Ex- Challenger Team Coach (twitter is @mairu_XD if you want to either check what I know or just bitch xd because I know how you are going to take this)