I didn't mention John Elley, true, although having once been sounded out to write his biography I didn't exactly forget about him !
I was really confining myself to young officers - captains or even lieutenants when they came to work for him - who he mentored. Some of those you mention were career soldiers who were already of some standing and with other sources of patronage.
As for Harry Smith, it's curious to see you cite him as someone of limited means. I don't doubt you, but having spent a couple of years immersed in the affairs of the 95th Rifles, I know him as one of the very few in that regiment to have bought a step of promotion during this period and to have been considered one of the few gentlemen in an officers' mess full of 'soldiers of fortune'.