1: I don't quite know about Europe. But in Ancient China and China in WWI and WWII, those general who trained the army will be the one that lead it.
2: And what I meant is that if this new system does not make more sense than previous ones, it at least makes the same level of sense.
3: I don't quite understand the difference between your captain and lords.
4: I really really don't understand how what you described is different from Rome 2's system. City level and garrison ARE the main things that defined what you can recruit and how fast you can recruit.