I was useing the CR3 to CR5 really only as an example and ought to have said so (sorry). I was trying to get a time scale to it !
My plan was for it to be be based on Bxp and and not Cxp all along. The idea of making it so you had to reach CR5 first was simply part of the game extention plan. If you don't like it then thats fair enough!
Just an Idea