I have a quick question, many people have talked about how if you were to work for a firm the chances of you moving into a are slim. I don't understand, IB's also have prop desks and if you're really good you can move on there, right? I mean firms like FNYS, DRW, SIG, are very reputable and if you work for them that says a lot about you because they only hire top notch candidates. So why is the chance slim for a prop trader to work for a ? I just don't understand the rationale behind this. Could someone please explain it?